document.write('		<table border="0" cellspacing="0" cellpadding="0" align="center">');
function IsValidString(checkStr)
{
	var checkOK = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789_";
	var allValid = true;
	if (checkStr.length<6)
	allValid=false
	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;
	}
	}
	return allValid;
}

function checkForm( theform ) {
	with( document.userlogin ){
		

	    var objv = EMail.value;
		var pattern = /^([a-zA-Z0-9_-])+(\.([a-zA-Z0-9_-])+)*@([a-zA-Z0-9_-])+(\.([a-zA-Z0-9_-])+)+$/;
		flag = pattern.test(objv);
		if( !flag ) {
			alert("电子邮件：请您输入正确的电子邮件地址");
			EMail.focus();
			return(false);
		}
        
		if(!IsValidString(password.value)) {
			alert("密码：长度要求为6-20位,且只允许英文及数字组成.");
			password.focus();
			return(false);
		}
        
	

		if (VCode.value.length!=4 || isNaN(VCode.value)){
		    alert("请输入系统验证码且必须为4位数字！");
		    VCode.focus();
		    return(false);
	        }	

	}

}

         
document.write('<form action="../bbs/login.asp?action=chk" method="post" name="userlogin" onsubmit="return checkForm( this )">');document.write('<input name="comeurl" type="hidden" size=10 maxlength="20" value="../bbs/">');document.write(' <tr><td colspan=\"2\" height=10></td></tr> ');document.write('								<TR>');document.write('									<TD width=60 align=\"right\">用户名：</TD>');document.write('                  <TD><input name=\"username" type=\"text\" size=10 maxlength=\"100\"></TD>');document.write('								</TR>');document.write('				<tr><td colspan=\"2\" height=5></td></tr>');document.write('				<TR>');document.write('					<TD width=60 align=\"right\">密&nbsp;&nbsp;码：</TD>	');document.write('	                <td>');document.write('	                  <input name=\"password" type=\"password\" size=10 maxlength=\"20\">');document.write('	                </td>	');document.write('				</TR>');document.write('								<tr><td colspan=\"2\" height=5></td></tr>');document.write('								<tr><td colspan=\"2\" height=20 align=\"center\">');document.write('								  <a href=\"../bbs/reg.asp\"><IMG SRC=\"../shop/images/index/button_register.gif\" WIDTH=\"52\" HEIGHT=\"18\" BORDER=\"0\"></a>&nbsp;&nbsp;&nbsp;&nbsp;');document.write('								  <input type=\"image\" SRC=\"../shop/images/index/button_login.gif\" WIDTH=\"52\" HEIGHT=\"18\" BORDER=\"0\" ALT=\"登陆\" align=\"absmiddle\" value=\"Submit\" name=\"imgSubmit\"></a>');document.write('								</td></tr>');document.write('								<tr><td colspan=\"2\" height=5></td></tr>');document.write('								<tr><td colspan=\"2\" height=18 align=\"center\">');document.write('									<TABLE cellspacing=0 cellpadding=0 border=0 width=160>');document.write('								<TR>');document.write('									<TD align=\"center\">');document.write('									   <a href=\"../bbs/lostpass.asp\"><IMG SRC=\"../shop/images/index/button_password.gif\" WIDTH=\"70\" HEIGHT=\"18\" BORDER=\"0\"></a></TD>');document.write('								</TR>');document.write('								</TABLE>');document.write('								</td>');document.write('								</tr>');document.write('								</form>');document.write('		</table>');