function ChamaLink(nome,url,wt,ht) {
	var porHor;
	var posVer;
	var win;
	var theURL = url;
	var nomeWin = nome;
	var tamHor = wt;
	var tamVer = ht;
    posHor = (screen.width - tamHor) / 2;
	//alert(tamHor);
    posVer = (screen.height - tamVer) / 2;
    if (posHor < 0) posHor = 0;
    if (posVer < 0) posVer = 0;
    var features = 'toolbar=no,location=no,status=no,menubar=no,scrollbars=yes,resizable=yes';
    var settings = 'height=' + tamVer + ',';
    settings = settings + 'width=' + tamHor + ',';
    settings = settings + 'top=' + posVer + ',';
    settings = settings + 'left=' + posHor + ',';
    settings = settings + features;
    win = window.open(theURL,nomeWin,settings);
    win.window.focus();
}