function openPopup(pagina,nome,w,h){
	LeftPosition = (screen.width) ? (screen.width-w)/2 : 0;
	TopPosition = (screen.height) ? (screen.height-h)/2 : 0;
	settings = 'titlebar=no,toolbar=no,location=no,directories=no,status=no,menubar=no,scrollbars=no,resizable=no,height='+h+',width='+w+',top='+TopPosition+',left='+LeftPosition;
	var myWin = window.open(pagina,nome,settings);
}


function openModal(pUrl, pWidth, pHeight) {
	if (window.showModalDialog) {
		return window.showModalDialog(pUrl, window,
		  "dialogWidth:" + pWidth + "px;dialogHeight:" + pHeight + "px");
	} else {
		try {
			netscape.security.PrivilegeManager.enablePrivilege(
			  "UniversalBrowserWrite");
			window.open(pUrl, "wndModal", "width=" + pWidth
			  + ",height=" + pHeight + ",resizable=no,modal=yes");
			return true;
		}
		catch (e) {
			alert("Script não confiável, não é possível abrir janela modal.");
			return false;
		}
	}
}