function head_validate(){
	var nickName = $("#nickName").val();
	var logPsw = $("#logPsw").val();
	var code = $("#code").val();
	
	if (nickName == ""){
        alert("请输入用户名!");
        $("#nickName").focus();
        return false;
    }else if (logPsw == ""){
        alert("请输入密码!");
        $("#logPsw").focus();
        return false;
    }if (code == ""){
        alert("请输入验证码!");
        $("#code").focus();
        return false;
    }
   	
   	var md5random = $.ajax({
	                url : "/getmd5random.do",
	                async : false,
	                cache : false
	            }).responseText;
	$("#logPsw").val(hex_md5(hex_md5(logPsw)+md5random));
    document.getElementById("headLogin").submit();
}

function headLogin_enter(){    
    if(document.addEventListener){//如果是Firefox 
    	document.addEventListener("keypress",fireFoxHandler, true);
    }else{
    	document.attachEvent("onkeypress",ieHandler);
    }    
}

function fireFoxHandler(evt){
	alert(evt.keyCode)
    if(evt.keyCode==13){
    	head_validate();
    }
}
    
function ieHandler(event){
	event=event?event:(window.event?window.event:null);
    if(event.keyCode==13){
    	head_validate();
    }
}

var VerifyCodeTimes=1;
function refreshcode() {
    document.getElementById("imgshowcode").src = "/imagesCaptcha.jsp?" + +(VerifyCodeTimes++);
}