function changepic()
{
   document.images.faceimg.src="images/face/"+document.messageform.face.options[document.messageform.face.selectedIndex].value;
}
function changebrow()
{
   document.images.browimg.src="images/brow/"+document.messageform.brow.options[document.messageform.brow.selectedIndex].value;
}

//判断是不是数字
function isNumber(checkStr)
{              
	var checkOK = "0123456789-";              
	var allValid = true;              
	var decPoints = 0;              
	var allNum = "";              
	for (i = 0;  i < checkStr.length;  i++)              
	{              
		ch = checkStr.charAt(i);              
		for (j = 0;  j < checkOK.length;  j++)              
		  if (ch == checkOK.charAt(j))              
			break;              
		if (j == checkOK.length)              
		{              
		  allValid = false;              
		  break;              
		}              
		if (ch == ".")              
		{              
		  allNum += ".";              
		  decPoints++;              
		}              
		else              
		  allNum += ch;              
		}              
		if (!allValid)              
		{              
			return (false);              
		}              
		if (decPoints > 1)              
		{              
			return (false);              
		}              
		return (true);              
}  

function checklogin()
{
	if (document.messageform.username1.value == '')
	{       
		alert("请输入姓名！");
		document.messageform.username1.focus();
		return false;
	}
	if (document.messageform.subject.value == '')
	{
		alert("请输入留言主题！");
		document.messageform.subject.focus();
		return false
	}
	if (document.messageform.tel.value == '')
	{
		alert("请输入电话！");
		document.messageform.tel.focus();
		return false;
	}      
  
	if (!isNumber(document.messageform.tel.value))               
		{              
			alert("电话号码必须是数字!");              
			document.messageform.tel.focus();              
			document.messageform.tel.select();    
			return false;
		}              
	if (isNumber(document.messageform.tel.value))
		{
			if (document.messageform.tel.value.length<6)
			{   
				alert("电话号码位数不正确！请填写正确的电话号码!");              
				document.messageform.tel.focus();              
				document.messageform.tel.select();  
				return false;
			} 
		} 
		
		if (document.messageform.mobile.value!='')
	{
	if (!isNumber(document.messageform.mobile.value))               
		{              
			alert("手机号码必须是数字!");              
			document.messageform.mobile.focus();              
			document.messageform.mobile.select();    
			return false;
		} 
	if (isNumber(document.messageform.mobile.value))
		{
			if (document.messageform.mobile.value.length!=11  )
			{   

				alert("手机号码位数不正确! 应为11位!");              
				document.messageform.mobile.focus();              
				document.messageform.mobile.select();  
				return false;
			} 
		} 
	}
		
		if (document.messageform.address.value == '')
	{       
		alert("请输入地址！");
		document.messageform.address.focus();
		return false;
	}
			if (document.messageform.zipcode.value == '')
	{       
		alert("请输入邮编！");
		document.messageform.zipcode.focus();
		return false;
	}
	if (!isNumber(document.messageform.zipcode.value))               
		{              
			alert("邮编必须是数字!");              
			document.messageform.zipcode.focus();              
			document.messageform.zipcode.select();    
			return false;
		} 
	if (isNumber(document.messageform.zipcode.value))
		{
			if (document.messageform.zipcode.value.length!=6 )
			{   

				alert("邮编位数不正确！邮编应为6位!");              
				document.messageform.zipcode.focus();              
				document.messageform.zipcode.select();  
				return false;
			} 
		} 
	if (document.messageform.content.value == '')
	{
		alert("请输入内容！");
		document.messageform.content.focus();
		return false;
	}
	
		if  (document.messageform.email.value !=  '')
	{
		if(!/^\w+([-+.]\w+)*@\w+([-.]\w+)*\.\w+([-.]\w+)*$/.test(document.messageform.email.value)) 
		{ 
			alert("电子邮箱格式不对，请重新输入"); 
			document.messageform.email.focus();
			document.messageform.email.select(); 
			return false; 
		} 
	}
	
if (document.messageform.qq.value!='')
	{
	if (!isNumber(document.messageform.qq.value))               
		{              
			alert("QQ必须是数字!");              
			document.messageform.qq.focus();              
			document.messageform.qq.select();    
			return false;
		} 
	if (isNumber(document.messageform.qq.value))
		{
			if (document.messageform.qq.value.length < 5 )
			{   

				alert("QQ位数不正确!");              
				document.messageform.qq.focus();              
				document.messageform.qq.select();  
				return false;
			} 
		} 
	}
	return true;
}