function getURLParam(strParamName) {
  var strReturn = '';
  var strHref   = window.location.href;
  
  if (strHref.indexOf('?') > -1 ) {
    var strQueryString = strHref.substr(strHref.indexOf('?')).toLowerCase();
    var aQueryString   = strQueryString.split('&');
    for (var iParam=0; iParam<aQueryString.length; iParam++) {
      if (aQueryString[iParam].indexOf(strParamName.toLowerCase() + '=') > -1 ) {
        var aParam = aQueryString[iParam].split('=');
        strReturn  = aParam[1];
        break;
      }
    }
  }
  return unescape(strReturn);
}

function imgPreview(imgurl, w, h, scrollbars)
{
  var l=20;
  var t=20;
  if(typeof scrollbars == 'undefined') scrollbars='no'; 
  if(screen)
  {
    if(w>screen.width)  { w=screen.width; scrollbars='yes'; }
    if(h>screen.height) { h=screen.height; scrollbars='yes'; }
    l= (screen.width-w) / 2;
    t= (screen.height-h) / 2 - 20;
  }
  var options = 'left='+l+',top='+t+',width='+w+',height='+h+',toolbar=no,location=no,border=no,directories=no,status=no,menubar=no,resizable=yes,scrollbars='+scrollbars;
  var url='../img.php?URL='+escape(imgurl);
  var uid = new Date();
  var w=window.open(url,'I'+uid.getTime(),options);
  if (typeof(w)!='object' || w==null) location.href = url;
  else if((w)&&(w.focus)) w.focus();  
}