function troca(imgName,imgTroca){
	eval("document."+imgName+".src='../imagens/"+imgTroca+".gif';");
}
function troca_img(imgName,imgSrc){
	var f = (eval("document."+imgName+".src"));
	var t = f.length
	var g = (t-7)
	
	if (f.substring(t,g) != "_mo.gif"){
		eval("document."+imgName+".src='../imagens/"+imgSrc+"_mo.gif';");
	}else
		eval("document."+imgName+".src='../imagens/"+imgSrc+".gif';");
}