function showHideLayer(id)	{
	var obj = document.getElementById(id);		
	if(obj.style.display=="block"){
		obj.style.display="none";
	}else{
		obj.style.display="block";
		}
}

// ONLOAD
	// uso -> arOnload.push('findimg');
	var arOnload = new Array();
	var wol = window.onload;
	window.onload = function(){
		if (wol) wol.call();
		if (arOnload) {for (var i in arOnload) {arOnload[i].call();}}
		delete arOnload;
	}
	arOnload.push(findimg);

// HOVER DE IMAGENS
	var sufixoImgOver = '_ov';
	var classToOver = 'roll';
	var classDown = 'down';

	function roll(o,state){
		var i,isnode,src,ftype,newsrc,nownode;
		// loop através de todos os childNodes
		for (i=0;i<o.childNodes.length;i++){
			nownode = o.childNodes[i];
			// se o nó é um elemento
			// e é uma IMG, muda a variável e sai do loop
			if(nownode.nodeType==1 && /img/i.test(nownode.nodeName)){
				isnode = i;
				break;
			}
		}  // verifica o src e faz o roll-over
		if (o.locked){
			//o.locked from submenu.js
			return;
		}
		src = o.childNodes[isnode].src;
		ftype = src.substring(src.lastIndexOf('.'), src.length);
		if (state == 'over' && o.state != state) {
			//set over
			newsrc = src.replace(ftype, sufixoImgOver+ftype);
		} else if(o.state == 'over') {
			//set up
			newsrc = src.replace(sufixoImgOver,'');
		}
		if (newsrc) {
			o.state = state;
			o.childNodes[isnode].src=newsrc;
		}
	}
	function findimg(){
		var imgs,i;  // Faz um loop através de todas as imagens
		//verificando se alguma delas contém a classe da var 'classToOver'
		imgs=document.getElementsByTagName('img');
		for(i=0;i<imgs.length;i++){
			if(eval('/'+classDown+'/').test(imgs[i].className)) {
				roll(imgs[i].parentNode,'over');
			}
			if(eval('/'+classToOver+'/').test(imgs[i].className)) {
				// adiciona a função roll ao elemento-pai da imagem
				imgs[i].parentNode.onmouseover=function(){roll(this,'over'); };
				imgs[i].parentNode.onmouseout=function(){roll(this,'up');};
				imgs[i].parentNode.onfocus=function(){roll(this,'over');};
				imgs[i].parentNode.onblur=function(){roll(this,'up');};
			}
		}
	}
/*
DOWN
<script>
	var mnprodDown = id('id DOM da imagem');
	roll(mnprodDown.parentNode,'over');
	mnprodDown.parentNode.locked = true;
</script>
*/

//uso -> id("id_dom").value
	function id(idDesc){return document.getElementById(idDesc);}