The following Javascript can be used to verify that a value has been entered in all fields on a form.
function validate(form) {
var regex = /\w+/;
for(var i = 0; i < form.length; i++) {
var curr_el = form.elements[i];
if(!regex.test(curr_el.value)) {
alert("Please fill out all fields.");
curr_el.focus();
return false;
}
}
return true;
}