var xmlHttp;
function createXMLHttpRequest() {
  if (window.ActiveXObject) {
      xmlHttp = new ActiveXObject("Microsoft.XMLHTTP");
  }
  else if (window.XMLHttpRequest) {
      xmlHttp = new XMLHttpRequest();                
  }
  if (!xmlHttp) { // 异常，创建对象实例失败
	window.alert("不能创建XMLHttpRequest对象实例.");
	return false;
  }
}

function createXMLHttpRequestByObject(xmlObject) {
  if (window.ActiveXObject) {
      xmlObject = new ActiveXObject("Microsoft.XMLHTTP");
  }
  else if (window.XMLHttpRequest) {
      xmlObject = new XMLHttpRequest();                
  }
  if (!xmlObject) { // 异常，创建对象实例失败
	window.alert("不能创建XMLHttpRequest对象实例.");
	return false;
  }
  
  return xmlObject;
}

function ajaxvalidTest() {
 	var city = document.getElementById("city").value.Trim();
		if(title.indexOf("/")!=-1||city.indexOf("%")!=-1||city.indexOf("+")!=-1||city.indexOf("!")!=-1||city.indexOf("@")!=-1||city.indexOf("#")!=-1
		||city.indexOf("$")!=-1||city.indexOf("^")!=-1||city.indexOf("&")!=-1||city.indexOf("*")!=-1||city.indexOf("{")!=-1||city.indexOf("}")!=-1||
		city.indexOf("<")!=-1||city.indexOf(">")!=-1||city.indexOf("[")!=-1||city.indexOf("]")!=-1||city.indexOf("(")!=-1||city.indexOf(")")!=-1)
	{
		alert("标题中不能含有 /,%,+等特殊字符！");
		document.EditInfoForm.city.focus();
		return false;
	} 
	if(city=="")return;
	return true;
}