function getQueryVariable(variable) {
  var query = window.location.search.substring(1);
  var vars = query.split("&");
  for (var i=0;i<vars.length;i++) {
    var pair = vars[i].split("=");
    if (pair[0] == variable) {
      imgType = pair[1];
    }
  } 
}

getQueryVariable("imgType") ;

document.write('<a href="http://www.esoftpro.com/web_tools_google_pagerank_for_your_website.php"><img src=http://www.esoftpro.com/web_tools/google_pagerank/pagerank.php?imgType=' + imgType + '&domain=' + domain + ' border=0 title=\"Google PageRank of ' + domain +'\"></a>');