Put values from 2 select drop downs into one input with javascript

[doug7410]

Hello,

I need to make a form that can create a URL like the one below. I need to have two drop down boxes that get their selected values entered into another input with a + sign between them. I want to do this with javascript. I think the example below explains it. It seems like it should be simple, but I have very little experience with javascript. Thanks for your help.

This is what I want the form to do http://www.myurl.com?search=a+1

Here is the example form and what I need it to do.

<form method="GET" action="www.myurl.com">

<input type="hidden" name="search" value="search1+search2" />

<select name="search1">
<option value="a">A</option>
<option value="b">B</option>
</select>

<select name="search2">
<option value="1">1</option>
<option value="2">2</option>
</select>

</form>

As the url example shows, I don't want the form to pass the values from search1 or search2, only the value from the search input.

[cbVision]

Here's a jQuery solution:
http://jsfiddle.net/dfreema1/LsgAb/

[ZABI]

<form method="GET" action="http://www.myurl.com" onsubmit="alert(action+'?'+search1.value+'+'+search2.value);return false;">

<input type="hidden" name="search" value="search1+search2" />

<select name="search1">
<option value="a">A</option>
<option value="b">B</option>
</select>

<select name="search2">
<option value="1">1</option>
<option value="2">2</option>
</select>
<input type="submit">

</form>

[xelawho]

<form method="GET" action="www.myurl.com">
<input type="hidden" name="search" value="search1+search2" />
<input type="button" value="submit" onclick="getVals(this.form)"/>
</form>

<select id="search1">
<option value="a">A</option>
<option value="b">B</option>
</select>

<select id="search2">
<option value="1">1</option>
<option value="2">2</option>
</select>

<script type="text/javascript">
function getVals(frm){
frm.search.value=document.getElementById('search1').value+"+"+document.getElementById('search2').value;
frm.submit()
}
</script>