javscript: variable has no properties

im trying to iterate thru form elements and pull out the ones with "note" in their name. getting "elementName has no properties" with the following code, and i don't understand why? any help is greatly appreciated. thx!

changing "elementName=document.formNotes.elements[i].name;" to "alert(document.formNotes.elements[i].name);" gives me the name. why won't it transfer the name of the element to the variable?

thanks!

re: javscript: variable has no properties

Without the HTML it'd be difficult to say, but the code would work with, for example:
[html]<form name="formNotes">
<input type="text" name="notes">
<input type="button" onclick="saveNotes()" value="Save">
</form>[/html]

re: javscript: variable has no properties

Change this line-
elementName=document.formNotes.elements[i].name;
to this:
elementName=document.formNotes.elements[i].name || '';

Chances are your form has a fieldset or some other member that is counted as a form element but returns undefined for the name attribute.

Give your undefined's the empty string, which will return -1 for any indexOf call.