function Popup(texto, swidth, sheight)
{
    var tipo;

	if(navigator.appName == "Microsoft Internet Explorer" &&  
parseInt(navigator.appVersion) >= "4")	{
		//url para ie 4 ou maior
		if (navigator.appVersion.toLowerCase().indexOf("macintosh") > 0) {
		  swidth = swidth - 12;
		  sheight = sheight - 12;
		}
		else {
		  swidth = swidth;
		  sheight = sheight;
		}
	}
	else if(navigator.appName == "Microsoft Internet Explorer" &&  
parseInt(navigator.appVersion) < "4")	{
		//url para ie menores que 4
		if (navigator.appVersion.toLowerCase().indexOf("macintosh") > 0) {
		  swidth = swidth - 18;
		  sheight = sheight - 20;
		}
		else {
		  swidth = swidth;
		  sheight = sheight;
		}
	}
	else if(navigator.appName == "Netscape" && parseInt(navigator.appVersion) >= 
"4")	{
		//url para ns 4 ou maior
		if (navigator.appVersion.toLowerCase().indexOf("macintosh") > 0) {
		  swidth = swidth + 2;
		  sheight = sheight;
		}
		else {
		  swidth = swidth;
		  sheight = sheight;
		}
	}
	else if(navigator.appName == "Netscape" &&  parseInt(navigator.appVersion) < 
"4")	{
		//url para ns menores que 4
		if (navigator.appVersion.toLowerCase().indexOf("macintosh") > 0) {
		  swidth = swidth;
		  sheight = sheight;
		}
		else {
		  swidth = swidth;
		  sheight = sheight;
		}
	}

	tipo = 
"'toolbar=no,location=no,status=no,menubar=no,directories=no,scrollbars=yes,resizable=no,width=" 
+ swidth + ",height=" + sheight + ",left=100,top=100'";
	window.open(texto ,"janela",tipo);
}