function IsDigit(cCheck)
	{
	return (('0'<=cCheck) && (cCheck<='9'));
	}

function IsAlpha(cCheck)
	{
	return ((('a'<=cCheck) && (cCheck<='z')) || (('A'<=cCheck) && (cCheck<='Z')))
	}
function VerifyInput()
	{
    	if (document.form.guestname.value == "")
		{
		alert("请输入姓名！");
		document.form.guestname.focus();
		return(false);
		}
    	if (!(document.form.guestsex[0].checked || document.form.guestsex[1].checked))
		{
		alert("请选择性别！");
		return(false);
		}
    	if(document.form.guestmail.value != ""){
		var strmailadd=document.form.guestmail.value;
        	var temp="";
		var temp1="";
        	for(var nIndex=0; nIndex<strmailadd.length; nIndex++){
            	var cCheck = strmailadd.charAt(nIndex);
            	if(cCheck=='@') temp="verify";
		if(cCheck=='.') temp1="verify";
            	if(!(IsDigit(cCheck) || IsAlpha(cCheck)|| cCheck=='-' || cCheck=='_' || cCheck=='.' || cCheck=='@' )){
             	alert("邮件地址只能使用字母、数字、-、_、.、@，并且不能使用中文");
		document.form.guestmail.select();
		return(false);
	    	}
                                 
        	}
        	if(temp!="verify" || temp1!="verify"){
           	alert("邮件地址无效");
		document.form.guestmail.select();
    	   	return(false);
        	}
    		}else{
		//alert("邮件地址不能为空");
		//document.form.guestmail.focus();
		//return(false);
		}	
    	if (document.form.guesttitle.value == "")
		{
		alert("请输入留言标题！");
		document.form.guesttitle.focus();
		return(false);
		}
    	if (document.form.guestface.value == "")
		{
		alert("请点击图片选择头像！");
		return(false);
		}
    	if (document.form.guesticon.value == "")
		{
		alert("请选择留言心情图片！");
		return false;
		}
    	if (document.form.guestbody.value.length>300)
		{
		alert("您正文不超过300个字符！");
		document.form.guestbody.focus();
		return(false);
		}	

    	if (document.form.guestbody.value == "")
		{
		alert("您正文不得为空！");
		document.form.guestbody.focus();
		return(false);
		}
    	//var newwin=window.open('about:blank','w','status=no,toolbar=no,menubar=no,scrollbars=yes,resizable=no,left=200,top=30,width=477,height=400');
    	//newwin.focus();
    	//document.form.target='w';
    	return true;
	}

	function seticon(icon) {
		document.form.guesticon.value=icon;
	}

function GuestInput(){
    	if (document.guestsearch.searchword.value == "" || document.guestsearch.searchword.value == "关键字")
	{
		alert("请填写搜索关键字！");
		document.guestsearch.searchword.focus();
		return false;
	}
    	if (document.guestsearch.searchtype.value == "")
	{
		alert("请选择搜索类型！");
		document.guestsearch.searchtype.focus();
		return false;
	}
	document.guestsearch.submit();
}

function showhint(F) {
	var num = 250 - self.document.form.guestbody.value.length;
	var num1 = "";
	var key = self.event.keyCode;
	if(num <= 0 && key != 8 && key != 46 && !(key >= 33 && key <=40) && F == 1) {
		alert("内容超长(250个汉字，包括空格和回车)，请修改！");
	}
	var col = "#000000";
	if(num >= 0) {
		num1 = "剩余字符长度：" + num;
		if(num <= 10) col = "#CC3300";
	} 
	else { num2 = (-1) * num;
		num1 = "内容超长" + num2 + "字符";
		col = "#FF0000";
	}
	document.form.charleft.value = num1;
	document.form.charleft.style.color = col;
}