function openwindow1(href, width, height)
 {
     var width  = (width == null)? 800 : width;
     var height = (height == null)? 600 : height;
     
     var xpos = (window.screen.availWidth  - width)/2;
     var ypos = (window.screen.availHeight - height)/2;
     
     var wnd  = null; //GetWindowWithLocation(window,href)
     if(wnd == null)
     {
          
          window.open(href,"_blank","left="+xpos+",top="+ypos+",width="+width+",height="+height+",center=yes,resizable=yes,status=no,scrollbars=no,help=no");
     }
     else
     {
          wnd.location.reload(true);
          wnd.focus();
     }
     
 }
 
function openwindow2(url)
{ 
  window.open(url, "new_window", "width=1000, height=800"); 

}