var newWindow;
function popup(URL,width,height) 
{
	if(!newWindow || newWindow.closed )
	{
		newWindow = window.open(URL, 
                        'script','toolbar=0,scrollbars=no,location=no,statusbar=no,menubar=no,resizable=no,dependent=yes,width='+width+',height='+height+',left=60,top=60');
	    newWindow.focus();
	}
	else
	{
		newWindow.location = URL;
		newWindow.focus();
	}
}