function pop(desktopURL, sizeX, sizeY, popup_name) {
    
    desktopURL = encodeURI(desktopURL);
    var DownAl = screen.availHeight;
    var RightAl = screen.availWidth;
    var tester_width = (RightAl - sizeX) / 2;
    var tester_height = (DownAl - sizeY) / 2;
    
    if (sizeY > DownAl) {sizeY = DownAl - 40;}
    	else {sizeY = sizeY;}
    if (sizeX > RightAl) {sizeX = RightAl - 20;}
    	else {sizeX = sizeX;}
    var desktop = window.open(desktopURL, popup_name,'toolbar=no,location=no,status=yes,menubar=no,scrollbars=no,resizable=yes,left='+tester_width+',screenX=0,top='+tester_height+',screenY=0,width='+ sizeX +',height='+ sizeY);
    //if (window.focus) {desktop.focus();}
    
  }