<!--
function checkspace(checkstr) {
  var str = '';
  for(i = 0; i < checkstr.length; i++) {
    str = str + ' ';
  }
  return (str == checkstr);
}

function checkemail()
{
  
  if(document.submitemail.emailaddress.value.length!=0)
  {
    if (document.submitemail.emailaddress.value.charAt(0)=="." ||        
         document.submitemail.emailaddress.value.charAt(0)=="@"||       
         document.submitemail.emailaddress.value.indexOf('@', 0) == -1 || 
         document.submitemail.emailaddress.value.indexOf('.', 0) == -1 || 
         document.submitemail.emailaddress.value.lastIndexOf("@")==document.submitemail.emailaddress.value.length-1 || 
         document.submitemail.emailaddress.value.lastIndexOf(".")==document.submitemail.emailaddress.value.length-1)
     {
      alert("Email address is incrrect！");
      document.submitemail.emailaddress.focus();
      return false;
      }
   }
 else
  {
   alert("Please enter your email address!");
   document.submitemail.emailaddress.focus();
   return false;
   }

}
//-->