//去掉空格
String.prototype.trim = function()
{
    return this.replace(/(^\s*)|(\s*$)/g, "");
}

function checkCode(typeNo,div,msg){
	var typeNo=document.getElementById(typeNo).value;
	var divSpan=document.getElementById(div);

	var imagePath;
	if(typeNo.trim()==''){
		imagePath = webroot + 'page/frontsystem/images/no.gif';
		divSpan.innerHTML="<img id='codeImg'> "+msg+"不能为空";
		validateCode=false;
	}else{
	if(typeNo.length!=4){
			imagePath = webroot + 'page/frontsystem/images/no.gif';
			divSpan.innerHTML="<img id='codeImg'> "+msg+"长度必须为4";
			validateCode=false;
		}else{
			imagePath = webroot + 'page/frontsystem/images/yes.gif';
			divSpan.innerHTML="<img id='codeImg' >";
			validateCode=true;
		}
	}
	document.getElementById('codeImg').src = imagePath;
	
	return validateCode;
}
  
function validates(){
	
	var validateCode=document.getElementById("validateCode").value;
	
	if(validateCode!=""){
		validateCode=true;
	}
	
	
	if(validateCode){	
		document.forms[0].submit();	
	}else{
		var messageSpan=document.getElementById("messageDiv");
		messageSpan.innerHTML="请核对登陆信息";
	}
}

function changeImg(objV){
	
	var now = new Date();
	objV.src=webroot+"page/frontsystem/common/verify_image.jsp?now="+now.getTime().toString();
}