including external js script

[Neddy]

hi

i dont know if this is the best way of doing this but this works locally

what im trying to do is make 2 drop down boxes, one with make and one with model (cars) when the make is changed the model drop down is updated... i could do this easy peasy but i dont wanna refresh the page.

heres what i have and it works perfectly locally in ie6 (not tested in any other browser yet) but i upload all the files (.html/.js) and it doesnt work properly...

<script language="javascript">
function seconddrop(selected)
{
	for(i=0;i<document.forms['filter'].model.options.length;i++) {
		document.forms['filter'].model.options.length=1;
	}
    var html_doc = document.getElementsByTagName('head').item(0);
    var js = document.createElement('script');
    js.setAttribute('language', 'javascript');
    js.setAttribute('type', 'text/javascript');
    js.setAttribute('src', selected+'.js');
    html_doc.appendChild(js);
    return false;

}
</script>

<form id="filter" method="POST" action="">
	<p>
	<select size="1" name="make" ONCHANGE="seconddrop(this.value);">
	<option selected value="CHOOSE">CHOOSE</option>
	<option value="Fiat">Fiat</option>
	<option value="Ford">Ford</option>
	</select>
	<select size="1" name="model">
	<option selected>CHOOSE</option>
	<option>bob</option>
	<option>bob2</option>
	</select>
	</p>
</form>

the js im including looks like this

document.forms['filter'].model.options[1] = new Option('FORD1','FORD1');
document.forms['filter'].model.options[2] = new Option('FORD2','FORD2');
document.forms['filter'].model.options[3] = new Option('FORD3','FORD3');
document.forms['filter'].model.options[4] = new Option('FORD4','FORD4');

i have no idea where the script is failing online but i know its getting past the for loop because the second dropdown box options are getting cleared

ive tried searching google but tbh i havnt a clue if im searching for the right things. i dont know all that much about js. also ive made this script out of bits ive found online so i could be doing it completly wrong.

thanks for any help.

[Neddy]

ok sorry ive now fixed this

not sure wether it was the fact that my dropdown value was Ford instead of ford or wether it was a permission thing beause i changed both of them and now it seems to be working...