function validate()
{
     var ErrorFound = 0
     if (document.ContactForm.tbFullName.value == "")
     {
          alert("Please enter your full name.");
          ContactForm.tbFullName.focus();
          ErrorFound = ErrorFound + 1
     }
     if (ErrorFound == 0)
     {
          if (document.ContactForm.tbEmail.value == "")
          {
               alert("Please enter email address.");
               ContactForm.tbEmail.focus();
               ErrorFound = ErrorFound + 1
          }
     }
     if (ErrorFound == 0)
     {
		      if (echeck(document.ContactForm.tbEmail.value) == false)
		      {
		           alert("Invalid email address");
               ContactForm.tbEmail.focus();
               ErrorFound = ErrorFound + 1;
          }
		 }
     if (ErrorFound == 0)
     {
          document.ContactForm.submit();
     }
}