Dynamic JavaScript Image SRC Path Replacement

I'm trying to use JS to dynamically replace an image on a page based upon the value of the selected option of a select dropdown. Everything in the code I've included below works perfectly. My "selected_text" variable is properly pulling the value of the selected option in my select dropdown, but I need to somehow write that value to the replacement img src path.

IE: If someone selects "Audi" from my select 开发者_开发技巧dropdown, I want to write "Audi" where I have "[selected_text]" in my replacement img src path.

Any ideas?

<script type="text/javascript">
function popmake() {
    var w = document.vafForm.make.selectedIndex;
    var selected_text = document.vafForm.make.options[w].text;
    document.getElementById('make-image').src="/path/to/images/[selected_text].jpg";
}
</script>

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what about

document.getElementById('make-image').src="/path/to/images/" + selected_text + ".jpg";

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It's simple as string concatenation:

document.getElementById('make-image').src="/path/to/images/"+selected_text+".jpg";

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Well, you could have that string somewhere like:

var path_to_images = "/path/to/images/[selected_text].jpg";

... code ...

var selected_text = document.vafForm.make.options[w].text;

document.getElementById('make-image').src = path_to_image.replace("[selected_text]", selected_text);