Hi guys

I want to display a error message if a certain value is choosen

var inpObjs = document.getElementsByName('typeofbike[]');
validChars=/^[a-zA-Z\d]{16}$/;
for(i=0; i < inpObjs.length; i++){
if(validChars.test(inpObjs[i].value='I will be using my own bike')){
alert("Please ring the office");
return false;
}
}

Where am I going wrong?