function Juge()
{
    with(document.form123)
	{
		if (uname.value == "")
		{
			alert("姓名不能为空!");
			uname.focus();
			return (false);
		}
		if (email.value != ""&&!isEmail(email.value))
		{
			alert("E-mail格式错误!");
			email.focus();
			return (false);
		}
		if (!isNumber(tel.value)||tel.value=="")
		{
			alert("电话请输入数字!");
			tel.focus();
			return (false);
		}
		if (content.value == "")
		{
			alert("留言内容不能为空!");
			content.focus();
			return (false);
		}
	}
	return true;
}



function isNumber(oNum){ 
	if(!oNum) return false; 
	var strP=/^\d+(\.\d+)?$/; 
	if(!strP.test(oNum)) return false; 
	try{ 
		if(parseFloat(oNum)!=oNum) return false; 
	}catch(ex){ 
		return false; 
	} 
	return true; 
}

function isEmail(emailStr){
	if(emailStr.charAt(0) == "." || emailStr.charAt(0) == "@" || emailStr.indexOf('@', 0) == -1|| emailStr.indexOf('.', 0) == -1 || emailStr.lastIndexOf("@") == emailStr.length-1 || emailStr.lastIndexOf(".") == emailStr.length-1){
		return false;	
	}else{
		return true;	
	}
}

function checktype()
{
    with(document.searchform)
	{
		if (searchtype.value == "")
		{
			alert("搜索类型不能为空!");
			searchtype.focus();
			return (false);
		}
	}
	return true;
}