function validatelogin(input) {
	//email
    if( !input.email.value ) {	
      alert("Please enter your email address. ");
      input.email.focus();
      input.email.select();
      return false;
    }
	if( input.email.value ) {
   		var re_mail = /^([a-zA-Z0-9_\.\-])+\@(([a-zA-Z0-9\-])+\.)+([a-zA-Z])+$/;
     	if( !re_mail.test( input.email.value ) ) {
        	alert(" Please enter a valid email address. ");
	        input.email.focus();
    	    input.email.select();
        	return false;
	    }
	}
	//password
    if( !input.password.value ) {	
      alert("Please enter your password. ");
      input.password.focus();
      input.password.select();
      return false;
    }
}