var changeSize = {
		sizeUnit:       "px",
		defaultSize:    11,		
		maxSize:        20,		
		minSize:        9,			
		adjustList:[],
		
		setDefaults:function(unit,dflt,mn,mx,sels){
			this.sizeUnit=unit;
			this.defaultSize=dflt;
			this.maxSize=mx;
			this.minSize=mn;
			if(sels)this.set(dflt,mn,mx,sels);
		},
		
		set:function(dflt,mn,mx,sels){
			var ln=this.adjustList.length;
			for(var i=0; sels[i]; i++){
				this.adjustList[ln+i]=[];
				this.adjustList[ln+i]["sel"]=sels[i];
				this.adjustList[ln+i]["dflt"]=dflt;
				this.adjustList[ln+i]["min"]=mn||this.minSize;
				this.adjustList[ln+i]["max"]=mx||this.maxSize;
				this.adjustList[ln+i]["ratio"]=this.adjustList[ln+i]["dflt"]/this.defaultSize;
			}
		},
		
		init:function(){
			if(!document.getElementById||!document.getElementsByTagName||!changeSize.ready)return;
			var size,sizerEl,i;
			if(isNaN(parseFloat(size))||size>this.maxSize||size<this.minSize){
				if(isNaN(parseFloat(size))||size>this.maxSize||size<this.minSize){
					size=this.defaultSize;
				}
			}
			this.curSize=this.defaultSize;
			sizerEl=document.getElementById('sizer');
			if(sizerEl) sizerEl.style.display="block";
			if(this.adjustList.length==0){
				this.setDefaults(this.sizeUnit,this.defaultSize,this.minSize,this.maxSize,['body','td']);
			}
			if(size!=this.defaultSize) this.adjust(size-this.defaultSize);
		},
		
		adjust:function(n){
			if(!this.curSize||!changeSize.ready) return;
			var alist,size,list,i,j;
			if(n>0){
				if(this.curSize+n>this.maxSize)n=this.maxSize-this.curSize;
			}
			else if(n<0){
				if(this.curSize+n<this.minSize)n=this.minSize-this.curSize;
			}
			if(n==0) return;
			this.curSize+=n;
			alist=this.adjustList;
			for(i=0; alist[i]; i++){
				size=this.curSize*alist[i]['ratio'];
				size=Math.max(alist[i]['min'],size);
				size=Math.min(alist[i]['max'],size);
				list=jg_getElementsBySelector(alist[i]['sel']);
				for(j=0; list[j]; j++){
				list[j].style.fontSize=size+this.sizeUnit;
				}
			}
		},
		
		reset:function(){
			if(!this.curSize||!changeSize.ready)return;
			var alist=this.adjustList,list,i,j;
			for(i=0; alist[i]; i++){
				list=jg_getElementsBySelector(alist[i]['sel']);
				for(j=0; list[j]; j++){
				list[j].style.fontSize='';
				}
			}
			this.curSize=this.defaultSize;	
		}
};

function jg_getElementsBySelector(selector){
	if(!document.getElementsByTagName) return[];
	var nodeList=[document],tokens,bits,list,col,els,i,j,k;
	selector=selector.normalize();
	tokens=selector.split(' ');
	for(i=0; tokens[i];	i++){
	if(tokens[i].indexOf('#')!=-1){
		bits=tokens[i].split('#');
		var el=document.getElementById(bits[1]);
		if(!el)return[];
		if(bits[0]){
			if(el.tagName.toLowerCase()!=bits[0].toLowerCase())return[];
		}
		for(j=0; nodeList[j]; j++){
			if(nodeList[j]==document||jg_contained(el,nodeList[j]))nodeList=[el];
			else return[];
		}
	}
	else if(tokens[i].indexOf('.')!=-1){
		bits=tokens[i].split('.');
		col=[];
		for(j=0; nodeList[j]; j++){
			els=jg_getElementsByClassName(bits[1],bits[0],nodeList[j]);
			for(k=0; els[k]; k++){
			col[col.length]=els[k];
			}
		}
		nodeList=[];
		for(j=0; col[j]; j++){
		nodeList.push(col[j]);
	}
	}
	else{
	els=[];
	for(j=0; nodeList[j]; j++){
		list=nodeList[j].getElementsByTagName(tokens[i]);
		for(k=0; list[k]; k++){
			els.push(list[k]);
		}
	}
	nodeList=els;
	}
	}
	return nodeList;
};

function jg_getElementsByClassName(sClass,sTag,oCont){
	var result=[],list,i;
	var re=new RegExp("\\b"+sClass+"\\b","i");
	oCont=oCont?oCont:document;
	if(document.getElementsByTagName){
		if(!sTag||sTag=="*"){
			list=oCont.all?oCont.all:oCont.getElementsByTagName("*");
		}
		else{
			list=oCont.getElementsByTagName(sTag);
		}
		for(i=0; list[i]; i++) if(re.test(list[i].className)) result.push(list[i]);
	}
	return result;
};

function jg_contained(oNode,oCont){
	if(!oNode)return;
	while(oNode=oNode.parentNode)if(oNode==oCont)return true;
	return false;
};

if(!Array.prototype.push){
	Array.prototype.push=function(){
		for(var i=0; arguments[i]; i++) this[this.length]=arguments[i];
		return this[this.length-1];
	}
};

String.prototype.normalize=function(){
	var re=/\s\s+/g;
	return this.trim().replace(re," ");
};

String.prototype.trim=function(){
	var re=/^\s+|\s+$/g;
	return this.replace(re,"");
};

changeSize.ready=true;