function checkReturn(e) {
 var ENTER_KEY = 13;
            var code = "";
      
 if (window.event) // IE
            {
                code = e.keyCode;
            }
            else if (e.which) // Netscape/Firefox/Opera
            {
                code = e.which;
            }
 if(code == ENTER_KEY) {
  submit_login_form(document.forms['agent_login_frm']);
 
 }
}

		
function submit_login_form(formObj){
	if(is_empty(formObj.txt_agent_code,formObj.txt_agent_code.value) || formObj.txt_agent_code.value == 'Agent Code') {
		alert('Enter Agent Code.');
		formObj.txt_agent_code.focus();
		//return false;
	} else if(is_empty(formObj.txt_username,formObj.txt_username.value) || formObj.txt_username.value == 'Username') {
		alert('Enter Username.');
		formObj.txt_username.focus();
		//return false;
	} else if(is_empty(formObj.txt_password,formObj.txt_password.value) || formObj.txt_password.value == 'Password') {
		alert('Enter Password.');
		//return false;
	} else {
		formObj.submit();
	}
}