function verifica() {
	//  Win
	isWin = (navigator.platform.indexOf('Win')!=-1) ? true:false
	//  Mac
	isMac = (navigator.platform.indexOf('Mac')!=-1) ? true:false
	//  IE4
	isIE4 = (document.all && !document.getElementById) ? true:false
	//  IE5
	isIE5 = (document.all && document.getElementById) ? true:false
	//  IE4, IE5
 	isIE = (isIE4 || isIE5) ? true:false
	//  Netscape 4
	isNav = (document.layers) ? true:false
	//  Netscape 6
	isNav6 = (!document.all && document.getElementById) ? true:false
	// anterior a  4
	isOld = (parseInt(navigator.appVersion) < 4) ? true:false
	// para funcionar Netscape 6
	if(isNav6){
		document.all=document.getElementsByTagName("*");
	}
}
// show -  hide dos layers
function showL(obj){
	switch (typeof obj)
	{
		case "string":
			if(isNav) {
				eval("document.layers['"+obj+"'].visibility= 'show'")
			}
			else {
	
eval("document.all['"+obj+"'].style.visibility = 'visible'")
			}
			break
		case "object":
			if(isNav) {
				obj.visibility = 'show'
			}
			else {
				obj.style.visibility = 'visible'
			}
			break
		default:
			alert("Precisa definir o Layer")
	}
}
function hideL(obj){
	switch (typeof obj)
	{
		case "string":
			if(isNav) {
				eval("document.layers['"+obj+"'].visibility= 'hide'")
			}
			else {
	
eval("document.all['"+obj+"'].style.visibility = 'hidden'")
			}
			break
		case "object":
			if(isNav) {
				obj.visibility = 'hide'
			}
			else {
				obj.style.visibility = 'hidden'
			}
			break
		default:
			alert("Precisa definir o Layer")
	}
}