function OpenNewWindow(url,xsize,ysize)
{
     ScreenWidth = screen.width;
     ScreenHeight = screen.height;
     xpos = (ScreenWidth/2)-(xsize/2);
     ypos = (ScreenHeight/2)-(ysize/2);
     popupWin = window.open(url,"name","toolbar=0,location=0,scrollbars=1,menubars=0,resizable=0,width="+xsize+",height="+ysize+",top="+ypos+",left="+xpos+"");
     popupWin.focus();
}