check extenstions on multiple file attachments

Hi,

Can someone tell me what I am doing wrong. Script works on the first attachment but not the other two?

[CODE]<script type=”text/javascript” language=”JavaScript”><!–
function ExtensionsOkay() {
var extension = new Array();
var fieldvalue = new Array();
fieldvalue[0] = document.customApp.attachment_1.value;
fieldvalue[1] = document.customApp.attachment_2.value;
fieldvalue[2] = document.customApp.attachment_3.value;
extension[0] = “.doc”;
extension[1] = “.docx”;
extension[2] = “.txt”;
extension[3] = “.pdf”;

// No other customization needed.
for(var f = 0; f < fieldvalue.length; f++) {
var thisext = fieldvalue[f].substr(fieldvalue[f].lastIndexOf(‘.’));
for(var i = 0; i < extension.length; i++) {
if(thisext == extension[i]) { return true; }
}
alert(“Your upload field ” + f + ” contains an unapproved file name.”);
return false;
}
}
//–></script>[/CODE]

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