Is there a way to do this in Mozilla?

Here's what i've got so far:

function trim(n)
{
return n.replace(/^\s*(.*?)\s*$/,'$1');
}

function validPhoneNumber(n)
{
  return ((0==trim(n).search(
    '[2-9][0-9]{2}[ \-\.\/][2-9][0-9]{2}[ \-\.][0-9]{4}'+
    '|[2-9][0-9]{2}[ \-\.][0-9]{4}'))
           ?1
           :0);
}
var validHomePhone = 0;
function validatePhone(frm,elem)
{
var obj = eval('document.' + frm + '.'+ elem);
var lbl = eval('document.all.lbl' + elem);
lbl.color = validPhoneNumber(obj.value) ? "black" : "red";
}

< font id="lblfoo" color="black">< b>Home Phone:< /b>< /font>
< input type="text" name="foo" id="foo"
onchange="validatePhone('myform','HomePhone')" >