function openSubWindow(target_html){
     x=(screen.availWidth/10)*9;
    if(x<=0)
      x=720;
    y=(screen.availHeight/10)*9;
    if(y<=0)
     y=500;
    subwin=window.open("","PaintChatEasy","width=100,height=100,menubar=0,location=0,directoryis=0,statue=0,scrollbars=1,alwaysRaised=1,resizable=1");
    subwin.moveTo(0,0);
    subwin.resizeTo(x,y);
    subwin.focus();
    subwin.opener.blur();
    subwin.location.replace(target_html);
}