function checkform(form)
{
  if (form.Name.value == "") 
  {
    alert( "Please enter your Name." );
    form.Name.focus();
    return false ;
  } 

  if(form.Email.value=="")
  {
  	alert("Please enter your E-mail address.");
  	form.Email.focus();
  	return false;
  }
  if(form.Email.value!="")
  {
   var txtval;       
   txtval=form.Email.value;
    var regExEmail=/^([0-9a-zA-Z]([-.\w]*[0-9a-zA-Z])*@([0-9a-zA-Z][-\w]*[0-9a-zA-Z]\.)+[a-zA-Z]{2,9})$/; 
    if(!(regExEmail.test(txtval)))
    {
       alert("Please Enter valid Email");
       form.Email.focus();
       return false; 
    }
  }
   return true ;
}