function popUp(url,x,y) {
 var winX = ((screen.availWidth/2)-(x/2));
 var winY = ((screen.availHeight/2)-(y/2));
 window.open(url,"page","height="+y+",width="+x+",toolbar=0,menubar=0,directories=0,scrollbars=1, resise=0,left="+winX+",top="+winY);
 }