can any1 look at it?

function IsNumeric(sText)
{
var ValidChars = "0123456789.";
var IsNumber=true;
var Char;

alert("GHJHGH");
alert(sText);
for (i = 0; i < sText.length && IsNumber == true; i++)
{
Char = sText.charAt(i);
if (ValidChars.indexOf(Char) == -1)
{
alert("NUMBER!");
IsNumber = false;
}
}
return IsNumber;

}
//-->

<!--
function confirmation() {
var answer = confirm("Are you sure you want to SAVE the form?")
if (answer){
return true;
}
else{
return false;
}
}
//-->


<!-- Begin
function checkrequired(which) {
var pass=true;
if (document.images) {
for (i=0;i<which.length;i++) {
var tempobj=which.elements[i];
if (tempobj.name.substring(0,8)=="required") {
if (((tempobj.type=="text"||tempobj.type=="textarea")&&
tempobj.value=='')||(tempobj.type.toString().charA t(0)=="s"&&
tempobj.selectedIndex==0)) {
pass=false;
break;
}
}
}
}
if (!pass) {
shortFieldName=tempobj.name.substring(8,30).toUppe rCase();
alert("Please make sure the "+shortFieldName+" field was properly completed.");
return false;
}
else
{
var isnum =true;
if(tempobj.name.substring(0,13) == "requiredJOBNO"){
isnum = IsNumeric(which);}

var answer = confirmation();
if(answer && isnum){
return true;
}
return false;
}

}
// End -->
</script>


i use the onSubmit to call the checkrequired function
tehn i will use the function to check if the fields have been entered by the user

then i will go on to check if the jobno field is numeric... but then i have a prob... it dun seems to go into the isnumeric function
and i am not sure how to work with the WHICH( as in how to get values out or the name...)

can any1 pls help???
thks