function setBackLink(site, page) {
  if(page == "HOME") return;
  var link = (typeof(page) == "undefined") ? site : ("http://www.fair.iic-china.com/" + site+ "/" + page + ".HTM");
  var hiddens = document.getElementsByTagName("input");
  for(var i = 0; i < hiddens.length; i++) {
    if(hiddens[i].name == 'backlink' || hiddens[i].name == 'closelink') 
       hiddens[i].value = link;
  }
  if(typeof(ocms_de_data) != 'undefined') {
    for (var key in ocms_de_data) {
      if(ocms_de_data[key] && ocms_de_data[key].backlink) ocms_de_data[key].backlink = link;
      if(ocms_de_data[key] && ocms_de_data[key].closelink) ocms_de_data[key].closelink = link;
    }
  }
}
var trimReg = /^\s*(.*?)\s*$/;
String.prototype.trim = function() {
  return this.replace(trimReg, "$1");
}