function addLoadEvent(func) {
  var oldonload = window.onload;
  if (typeof window.onload != 'function') {
    window.onload = func;
  } else {
    window.onload = function() {
      oldonload();
      func();
    }
  }
}


function validateForm(whichform) {

  
  var CityFrom_txtCity=document.getElementById("CityFrom_txtCity");
  var CityArray_txtCity=document.getElementById("CityArray_txtCity");
	var depDate=document.getElementById("et:depDate");
	
	if(!isFilled(CityFrom_txtCity)){alert("\u8BF7\u8F93\u5165\u51FA\u53D1\u57CE\u5E02");return false;}
	
	
	
	if(!isFilled(CityArray_txtCity)){alert("\u8BF7\u8F93\u5165\u5230\u8FBE\u57CE\u5E02");return false;}
	 if(!isFilled(depDate)){alert("\u8BF7\u8F93\u5165\u51FA\u53D1\u65E5\u671F");return false;}
	return true;
		 
}





function isFilled(field) {
  if (field.value.length < 1) {
    return false;
  } else {
    return true;
  }
}

function prepareForms() {
  for (var i=0; i<document.forms.length; i++) {
    var thisform = document.forms[i];
    
    thisform.onsubmit = function() {
      return validateForm(this);
    }
  }
}




addLoadEvent(prepareForms);