function doSearch() {
  var k = trim(document.searchForm.k.value);
  document.searchForm.k.value = k;
  var p_z_Z_Type = document.searchForm.p_z_Z_Type.value;
  var catId =document.searchForm.catId.value;
  if(k == "") {
    alert("请输入关键字！");
    return false;
  }
  if(p_z_Z_Type == "Allsearch") {
  	url = "http://www.cnfmw.com/trade/offer/search.asp?k=" + k
  	document.searchForm.action = url;
  	document.searchForm.submit();
  }
  if(p_z_Z_Type == "Sale") {
  	url = "http://www.cnfmw.com/trade/Buyer/search.asp?k=" + k
  	document.searchForm.action = url;
  	document.searchForm.submit();
  }
  if (p_z_Z_Type == "Buy") {
  	url = "http://www.cnfmw.com/trade/seller/search.asp?k=" + k
  	document.searchForm.action = url;
  	document.searchForm.submit();
  }
  if (p_z_Z_Type == "Product") {
  	url = "http://www.cnfmw.com/trade/product/search.asp?k=" + k
  	document.searchForm.action = url;
  	document.searchForm.submit();
  }
  if (p_z_Z_Type == "Company") {
  	url = "http://www.cnfmw.com/trade/company/search.asp?k=" + k
  	document.searchForm.action = url;
  	document.searchForm.submit();
  }
   
  if (p_z_Z_Type == "News") {
  	url = "http://www.cnfmw.com/news/search.asp?k=" + k
  	document.searchForm.action = url;
  	document.searchForm.method = "post";
  	document.searchForm.submit();
  }
    if (p_z_Z_Type == "Expo") {
  	url = "http://www.cnfmw.com/Expo/search.asp?k=" + k
  	document.searchForm.action = url;
  	document.searchForm.method = "post";
  	document.searchForm.submit();
  }
}

 function trim(inputString) {

       if (typeof inputString != "string") { return inputString; }
       var retValue = inputString;
       var ch = retValue.substring(0, 1);
       while (ch == " ") {
       //检查字符串开始部分的空格
           retValue = retValue.substring(1, retValue.length);
           ch = retValue.substring(0, 1);
       }
       ch = retValue.substring(retValue.length-1, retValue.length);
       while (ch == " ") {
          //检查字符串结束部分的空格
          retValue = retValue.substring(0, retValue.length-1);
          ch = retValue.substring(retValue.length-1, retValue.length);
       }
       while (retValue.indexOf("  ") != -1) {
      //将文字中间多个相连的空格变为一个空格
          retValue = retValue.substring(0, retValue.indexOf("  ")) + retValue.substring(retValue.indexOf("  ")+1, retValue.length);
       }
       return retValue;
    }