//============================================================================
function popupfrete(url,name,windowWidth,windowHeight){
	myleft=(screen.width)?(screen.width-windowWidth)/2:100;
	mytop=(screen.height)?(screen.height-windowHeight)/2:100;
	mytop=mytop-150;
	properties = "width="+windowWidth+",height="+windowHeight+",toolbar=no,location=no,directories=no,status=no,menubar=no,scrollbars=no,copyhistory=no,resizable=no, top="+mytop+",left="+myleft;
	newwindow=window.open(url,name,properties);
	if (window.focus) {newwindow.focus()}
}