var tempform
String.prototype.Trim = function()
{
  return this.replace(/(^\s*)|(\s*$)/g,'')
} 
function checkdata(tempform)
{
  if (tempform.search_key.value.Trim()=="")
  {
    alert("ÇëÄúÌîд¹Ø¼ü×Ö£¡")
    return false;
  }
  else
  tempform.submit()
}