function swapImage(img, strPath)
{
   img.src = strPath;
}

function openWinCenter ( url, vwidth, vheight, strWinName, haveScrollbars )
{
   var win;
   var w = vwidth;
   var h = vheight;
   var x = (screen.width - w)/2;
   var y = (screen.height - h)/2;

   win = window.open(url, strWinName,  'menubar=no,toolbar=no,location=no,directories=no,status=no,scrollbars='+haveScrollbars+',resizable=yes,width='+w+',height='+h+',left='+x+',top='+y+'')
   win.focus();
}