javascript验证身份证

<script>
  //检验身份证
function isIdCard(s) 
{
    var patrn = /^\s*\d{15}\s*$/;
    var patrn1 = /^\s*\d{16}[\dxX]{2}\s*$/;
    if(!patrn.exec(s) && !patrn1.exec(s))
    {
		alert("false");
        return false;
    }
	alert("true");
    return true;
}

</script>


<INPUT id="id" TYPE="text" VALUE="click me" ONblur="isIdCard(this.value)">