/*
	domtab version 3.1415927
	updated march the first 2006
	written by christian heilmann
	check blog for updates: http://www.wait-till-i.com	
	free to use, not free to resell
*/

domtab={
	tabclass:'domtab', // class to trigger tabbing
	listclass:'domtabs', // class of the menus
	activeclass:'active', // class of current link
	contentelements:'div', // elements to loop through
	backtolinks:/#top/, // pattern to check "back to top" links
	printid:'domtabprintview', // id of the print all link
	showalllinktext:'show all content', // text for the print all link
	prevnextindicator:'doprevnext', // class to trigger prev and next links
	prevnextclass:'prevnext', // class of the prev and next list
	prevlabel:'previous', // html content of the prev link
	nextlabel:'next', // html content of the next link
	prevclass:'prev', // class for the prev link
	nextclass:'next', // class for the next link
	init:function(){
		var temp;
		if(!document.getelementbyid || !document.createtextnode){return;}
		var tempelm=document.getelementsbytagname('div');		
		for(var i=0;i<tempelm.length;i++){
			if(!domtab.cssjs('check',tempelm[i],domtab.tabclass)){continue;}
			domtab.inittabmenu(tempelm[i]);
			domtab.removebacklinks(tempelm[i]);
			if(domtab.cssjs('check',tempelm[i],domtab.prevnextindicator)){
				domtab.addprevnext(tempelm[i]);
			}
			domtab.checkurl();
		}
		if(document.getelementbyid(domtab.printid) 
		   && !document.getelementbyid(domtab.printid).getelementsbytagname('a')[0]){
			var newlink=document.createelement('a');
			newlink.setattribute('href','#');
			domtab.addevent(newlink,'click',domtab.showall,false);
			newlink.onclick=function(){return false;} // safari hack
			newlink.appendchild(document.createtextnode(domtab.showalllinktext));
			document.getelementbyid(domtab.printid).appendchild(newlink);
		}
	},
	checkurl:function(){
		var id;
		var loc=window.location.tostring();
		loc=/#/.test(loc)?loc.match(/#(\w.+)/)[1]:'';
		if(loc==''){return;}
		var elm=document.getelementbyid(loc);
		if(!elm){return;}
		var parentmenu=elm.parentnode.parentnode.parentnode;
		parentmenu.currentsection=loc;
		parentmenu.getelementsbytagname(domtab.contentelements)[0].style.display='none';
		domtab.cssjs('remove',parentmenu.getelementsbytagname('a')[0].parentnode,domtab.activeclass);
		var links=parentmenu.getelementsbytagname('a');
		for(i=0;i<links.length;i++){
			if(!links[i].getattribute('href')){continue;}
			if(!/#/.test(links[i].getattribute('href').tostring())){continue;}
			id=links[i].href.match(/#(\w.+)/)[1];
			if(id==loc){
				var cur=links[i].parentnode.parentnode;
				domtab.cssjs('add',links[i].parentnode,domtab.activeclass);
				break;
			}
		}
		domtab.changetab(elm,1);
		elm.focus();
		cur.currentlink=links[i];
		cur.currentsection=loc;
	},
	showall:function(e){
		document.getelementbyid(domtab.printid).parentnode.removechild(document.getelementbyid(domtab.printid));
		var tempelm=document.getelementsbytagname('div');		
		for(var i=0;i<tempelm.length;i++){
			if(!domtab.cssjs('check',tempelm[i],domtab.tabclass)){continue;}
			var sec=tempelm[i].getelementsbytagname(domtab.contentelements);
			for(var j=0;j<sec.length;j++){
				sec[j].style.display='block';
			}
		}
		var tempelm=document.getelementsbytagname('ul');		
		for(i=0;i<tempelm.length;i++){
			if(!domtab.cssjs('check',tempelm[i],domtab.prevnextclass)){continue;}
			tempelm[i].parentnode.removechild(tempelm[i]);
			i--;
		}
		domtab.cancelclick(e);
	},
	addprevnext:function(menu){
		var temp;
		var sections=menu.getelementsbytagname(domtab.contentelements);
		for(var i=0;i<sections.length;i++){
			temp=domtab.createprevnext();
			if(i==0){
				temp.removechild(temp.getelementsbytagname('li')[0]);
			}
			if(i==sections.length-1){
				temp.removechild(temp.getelementsbytagname('li')[1]);
			}
			temp.i=i; // h4xx0r!
			temp.menu=menu;
			sections[i].appendchild(temp);
		}
	},
	removebacklinks:function(menu){
		var links=menu.getelementsbytagname('a');
		for(var i=0;i<links.length;i++){
			if(!domtab.backtolinks.test(links[i].href)){continue;}
			links[i].parentnode.removechild(links[i]);
			i--;
		}
	},
	inittabmenu:function(menu){
		var id;
		var lists=menu.getelementsbytagname('ul');
		for(var i=0;i<lists.length;i++){
			if(domtab.cssjs('check',lists[i],domtab.listclass)){
				var thismenu=lists[i];
				break;
			}
		}
		if(!thismenu){return;}
		thismenu.currentsection='';
		thismenu.currentlink='';
		var links=thismenu.getelementsbytagname('a');
		for(i=0;i<links.length;i++){
			if(!/#/.test(links[i].getattribute('href').tostring())){continue;}
			id=links[i].href.match(/#(\w.+)/)[1];
			if(document.getelementbyid(id)){
				domtab.addevent(links[i],'click',domtab.showtab,false);
				links[i].onclick=function(){return false;} // safari hack
				domtab.changetab(document.getelementbyid(id),0);
			}
		}
		id=links[0].href.match(/#(\w.+)/)[1];
		if(document.getelementbyid(id)){
			domtab.changetab(document.getelementbyid(id),1);
			thismenu.currentsection=id;
			thismenu.currentlink=links[0];
			domtab.cssjs('add',links[0].parentnode,domtab.activeclass);
		}
	},
	createprevnext:function(){
		// this would be so much easier with innerhtml, darn you standards fetish!
		var temp=document.createelement('ul');
		temp.classname=domtab.prevnextclass;
		temp.appendchild(document.createelement('li'));
		temp.getelementsbytagname('li')[0].appendchild(document.createelement('a'));
		temp.getelementsbytagname('a')[0].setattribute('href','#');
		temp.getelementsbytagname('a')[0].innerhtml=domtab.prevlabel;
		temp.getelementsbytagname('li')[0].classname=domtab.prevclass;
		temp.appendchild(document.createelement('li'));
		temp.getelementsbytagname('li')[1].appendchild(document.createelement('a'));
		temp.getelementsbytagname('a')[1].setattribute('href','#');
		temp.getelementsbytagname('a')[1].innerhtml=domtab.nextlabel;
		temp.getelementsbytagname('li')[1].classname=domtab.nextclass;
		domtab.addevent(temp.getelementsbytagname('a')[0],'click',domtab.navtabs,false);
		domtab.addevent(temp.getelementsbytagname('a')[1],'click',domtab.navtabs,false);
		// safari fix
		temp.getelementsbytagname('a')[0].onclick=function(){return false;}
		temp.getelementsbytagname('a')[1].onclick=function(){return false;}
		return temp;
	},
	navtabs:function(e){
		var li=domtab.gettarget(e);
		var menu=li.parentnode.parentnode.menu;
		var count=li.parentnode.parentnode.i;
		var section=menu.getelementsbytagname(domtab.contentelements);
		var links=menu.getelementsbytagname('a');
		var othercount=(li.parentnode.classname==domtab.prevclass)?count-1:count+1;
		section[count].style.display='none';
		domtab.cssjs('remove',links[count].parentnode,domtab.activeclass);
		section[othercount].style.display='block';
		domtab.cssjs('add',links[othercount].parentnode,domtab.activeclass);
		var parent=links[count].parentnode.parentnode;
		parent.currentlink=links[othercount];
		parent.currentsection=links[othercount].href.match(/#(\w.+)/)[1];
		domtab.cancelclick(e);
	},
	changetab:function(elm,state){
		do{
			elm=elm.parentnode;
		} while(elm.nodename.tolowercase()!=domtab.contentelements)
		elm.style.display=state==0?'none':'block';
	},
	showtab:function(e){
		var o=domtab.gettarget(e);
		if(o.parentnode.parentnode.currentsection!=''){
			domtab.changetab(document.getelementbyid(o.parentnode.parentnode.currentsection),0);
			domtab.cssjs('remove',o.parentnode.parentnode.currentlink.parentnode,domtab.activeclass);
		}
		var id=o.href.match(/#(\w.+)/)[1];
		o.parentnode.parentnode.currentsection=id;
		o.parentnode.parentnode.currentlink=o;
		domtab.cssjs('add',o.parentnode,domtab.activeclass);
		domtab.changetab(document.getelementbyid(id),1);
		document.getelementbyid(id).focus();
		domtab.cancelclick(e);
	},
/* helper methods */
	gettarget:function(e){
		var target = window.event ? window.event.srcelement : e ? e.target : null;
		if (!target){return false;}
		if (target.nodename.tolowercase() != 'a'){target = target.parentnode;}
		return target;
	},
	cancelclick:function(e){
		if (window.event){
			window.event.cancelbubble = true;
			window.event.returnvalue = false;
			return;
		}
		if (e){
			e.stoppropagation();
			e.preventdefault();
		}
	},
	addevent: function(elm, evtype, fn, usecapture){
		if (elm.addeventlistener) 
		{
			elm.addeventlistener(evtype, fn, usecapture);
			return true;
		} else if (elm.attachevent) {
			var r = elm.attachevent('on' + evtype, fn);
			return r;
		} else {
			elm['on' + evtype] = fn;
		}
	},
	cssjs:function(a,o,c1,c2){
		switch (a){
			case 'swap':
				o.classname=!domtab.cssjs('check',o,c1)?o.classname.replace(c2,c1):o.classname.replace(c1,c2);
			break;
			case 'add':
				if(!domtab.cssjs('check',o,c1)){o.classname+=o.classname?' '+c1:c1;}
			break;
			case 'remove':
				var rep=o.classname.match(' '+c1)?' '+c1:c1;
				o.classname=o.classname.replace(rep,'');
			break;
			case 'check':
				var found=false;
				var temparray=o.classname.split(' ');
				for(var i=0;i<temparray.length;i++){
					if(temparray[i]==c1){found=true;}
				}
				return found;
			break;
		}
	}
}
domtab.addevent(window, 'load', domtab.init, false);