/**删除字符串中的空格*/
function Trim(sText) 
{ 
    return sText.replace(new RegExp("(^[\\s]*)|([\\s]*$)", "g"), ""); 
}
function checkSurvey()			
{	
	if(Trim(document.getElementById("giftName").value)=="")
	{				
		alert("请填写您想要的奖品！");
		document.getElementById("giftName").focus();
		return;
	}
	var xmlHttp;					
	try				//获取XMLHttpRequest
	{    // Firefox, Opera 8.0+, Safari    
		xmlHttp=new XMLHttpRequest();				
	}
	catch (e)
	{    // Internet Explorer    
		try
		{
			xmlHttp=new ActiveXObject("Msxml2.XMLHTTP");					
		}
		catch (e)
		{
			try
			{
				xmlHttp=new ActiveXObject("Microsoft.XMLHTTP");						
			}
			catch (e)
			{
				alert("Your browser does not support AJAX!");					
			}
		}
	}
	var url;
	var giftName = document.getElementById("giftName").value;
	url = "getSurvey.jsp?giftName="+giftName;
	url += "&random="+Math.random(); 
	url += "&timestamp="+new Date().getTime(); 
	xmlHttp.onreadystatechange=function()
	{
		if(xmlHttp.readyState==4)
		{	
			var result = Trim(xmlHttp.responseText);
			var alertstr ="";
			if((result.toString()) == "error"){//失败
				alertstr ="您已经提交，感谢您的参与!";
				alert(alertstr);
				document.getElementById("giftSurvey").style.display = "none";
			}else if((result.toString()).toString() == "success"){//成功
				alertstr ="恭喜您提交成功,感谢您的参与!";
				alert(alertstr);
				document.getElementById("giftSurvey").style.display = "none";
			}
		
		 document.getElementById("trLoading").style.display = "none";
		}
	}			
	xmlHttp.open("GET",url,true);
	xmlHttp.send(null);
	document.getElementById("trLoading").style.display = "inline";
	document.getElementById("submit").disabled="disabled";
}