function CheckLogin()
{	
     if (document.formlogin.u_name.value.length==0) 
	 {
		alert("【提示】\n\n登录名不能为空！");
		document.formlogin.u_name.focus();
     	return false;
     }	
     ii=0;
     bString="abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789_";
	 while (ii<document.formlogin.u_name.value.length) 
	 {
		if (bString.indexOf(document.formlogin.u_name.value.substring(ii,ii+1))==-1) 
		{
			alert("【友情提示】\n\n用户名必须是 a-z A-Z 0-9 之间的字母和数字组合，长度不能超过16位。");
			document.formlogin.u_name.focus();
			return false;
		}
		ii=ii+1;
     }
     if (document.formlogin.u_password.value.length==0) 
	 {
		alert("【友情提示】\n\n密码不能为空！");
		document.formlogin.u_password.focus();
     	return false;
     }	
     return true;
}

document.write('<div style="padding-top:6px;">');document.write('<form action="/member/logincheck.asp" method="post" name="formlogin" onsubmit="if(this.password==\'\'){this.password=\'\'}" onsubmit="return CheckLogin()">');document.write('<input type="hidden" name="module" value="login" />');document.write('<input name="u_name" id="u_name" type="text" class="username" value="用户名" onfocus="if(this.value==\'用户名\'){this.value=\'\';this.style.color=\'#fff\';;this.style.background=\'url(/images/input_bg.gif) no-repeat bottom\';}" onblur="if(this.value==\'\'){this.value=\'用户名\';this.style.color=\'#999\';;this.style.background=\'url(/images/input_bg.gif) no-repeat\';}" style="color:#999;" />');document.write('<input name="u_password" id="u_password" type="password" class="username" value="请填写密码！" onfocus="if(this.value==\'请填写密码！\'){this.value=\'\';this.style.color=\'#fff\';;this.style.background=\'url(/images/input_bg.gif) no-repeat bottom\';}" onblur="if(this.value==\'\'){this.value=\'请填写密码！\';this.style.color=\'#999\';;this.style.background=\'url(/images/input_bg.gif) no-repeat top\';}" style="color:#999;" />');document.write('<input type="submit" name="button" id="button" value="提交" class="send" />');document.write('</form>');document.write('</div>');