function validateName(field) {
//var valid = "abcdefghijklmnopqrstuvwxyz0123456789"
var valid = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ "
var ok = "yes";
var temp;
for (var i=0; i<field.value.length; i++) {
temp = "" + field.value.substring(i, i+1);
if (valid.indexOf(temp) == "-1") ok = "no";
}
if (ok == "no") {
alert("Please enter your real name (numbers and special characters are not allowed).");
field.value='';
field.focus();
}
}