Hi,

Sorry for the vague title, but I have 2 javascript functions that display the value that was set on one of the options in a form selection box. Now I want to add a third function that will sum the values from the user's selections by pressing a button.

The code from the first part is this:

Code:
<script type="text/javascript">
window.onload=function(a,b)
{
	value=document.getElementById('value1'),
	combobox=document.getElementById('1');
	
	combobox.onchange=function(a)
	{
	document.getElementById('value1').innerHTML = "&euro; " +this.value;
	var r = this.value;
	}

	value2=document.getElementById('value2'), 
	combobox2=document.getElementById('2');
	
	combobox2.onchange=function(b)
	{
	document.getElementById('value2').innerHTML = "&euro; " +this.value;
	var q = this.value;
	}
}
</script>
So in a div with id value1 and a div with id value 2 the values from the user's selection will appear. No I'm trying to get a function to sum both values by clicking a button.

Whatever I try, nothing seems to work. Any help would be highly appreciated. Many thanks in advance!

Jerry