function _id(id){
	try{ return document.getElementById(id); }catch(e){ return undefined; }
}
function getElementPosition(el){
	var x=0; var y=0;
	while(el.offsetParent){
		x+=el.offsetLeft; y+=el.offsetTop;
		el=el.offsetParent;
	}
	x+=el.offsetLeft; y+=el.offsetTop;
	return { x:x, y:y };
}
window.compatibilizeEvent=function(e){
	if (e.srcElement && !e.target) {
		e.charCode=(e.type=="keypress")? e.keyCode : 0;
		e.isChar=(e.charCode>0);
		e.eventPhase=2;
		e.preventDefault=e.preventDefault || function(){
			this.returnValue=false;
		};
		e.stopPropagation=e.stopPropagation || function(){
			this.cancelBubble=true;
		};
		if(e.type=="mouseout"){
			e.relatedTarget=e.toElement;
		}else if(e.type=="mouseover"){
			e.relatedTarget=e.fromElement;
		}
		e.target=e.srcElement;
		e.time=(new Date).getTime();
		e.pageX=e.clientX+document.body.scrollLeft;
		e.pageY=e.clientY+document.body.scrollTop;
	}
	return e;
}
window.EventObject=function(){
	if (window.event) {
		return compatibilizeEvent(window.event);
	} else {
		return EventObject.caller.arguments[0];
	}
}
window.addListener=function(o, e, h){
	try{
		o.attachEvent("on"+e, h);
	}catch(a){
		o.addEventListener(e, h, false);
	}
}
window.removeListener=function(o, e, h){
	try{
		o.detachEvent("on"+e, h);
	}catch(a){
		o.removeEventListener(e, h, false);
	}
}
document.addListener=function(e, h){
	addListener(document, e, h);
}
document.removeListener=function(e, h){
	removeListener(document, e, h);
}
// funções de rolagem
_rolando={};
_rolando.intervalo=false;
_rolando.dir=0;
_rolando.vel=10;
_rolando.outerObj=false;
_rolando.innerObj=false;
function rolagem(){
	var visW=_rolando.outerObj.offsetWidth;
	var contW=_rolando.innerObj.offsetWidth;
	var pos=_rolando.innerObj.posAtual;
	// hack para larguras no mozilla
	if(navigator.appName.toLowerCase().indexOf("netscape")>-1){
		contW-=pos;
	}
	var newPos=pos-(_rolando.dir*_rolando.vel);
	var maxPos=-(contW-visW);
	newPos=(newPos>0)? 0 : newPos;
	newPos=(newPos<maxPos)? maxPos : newPos;
	_rolando.innerObj.style.marginLeft=newPos+"px";
	_rolando.innerObj.posAtual=newPos;
}
function rolar(oOb, iOb, dir, vel){
	if(_rolando.intervalo){
		clearInterval(_rolando.intervalo);
		_rolando.intervalo=false;
	}
	if(dir==0 || iOb.offsetWidth < oOb.offsetWidth){
		return;
	}
	vel=vel||10;
	_rolando.dir=dir;
	_rolando.vel=vel;
	_rolando.outerObj=oOb;
	_rolando.innerObj=iOb;
	if(iOb.posAtual===undefined){
		iOb.posAtual=getElementPosition(oOb).x-getElementPosition(iOb).x;
	}
	rolagem();
	window._rolando.intervalo=setInterval(rolagem, 50);
}


var _f=function(){
	var e=EventObject();
	if(e.target.tagName && e.target.getAttribute("rolagem")){
		var att=e.target.getAttribute("rolagem").replace(/ /g, "").split(",");
		var outerObj=document.getElementById(att[0]);
		var innerObj=document.getElementById(att[1]);
		var vel=att[3];
		switch(att[2]){
			case "esq":
				dir=-1;
				break;
			case "dir":
				dir=1;
				break;
			default:
				dir=0;
		}
		e.preventDefault();
		//e.stopPropagation();
		rolar(outerObj, innerObj, dir, vel);
	}
}
document.addListener("mousedown", _f);

var _f=function(){
	rolar(null, null, 0);
}
document.addListener("mouseup", _f);