Im not sure what name to give this Question.

But anyhows, here is my problem/question.

I have a 3 part form, With which drop boxes send it to a link. EG.

<select name="menu1"  onChange="MM_jumpMenu('parent',this,0)">
	        <option value="stage1.php?c=" selected>link</option>
          </select>

<select name="menu2"  onChange="MM_jumpMenu('parent',this,0)">
	        <option value="stage1.php?c= &y=" selected>link</option>
          </select>

<select name="menu3"  onChange="MM_jumpMenu('parent',this,0)">
	        <option value="stage1.php?c= &y= &m=" selected>link</option>
          </select>

So when the person selects the option on one drop box, it takes them to stage1.php?c=blahblah.

But im not sure on how to make it so all it does is overwrite what " C, Y or M " Equals.

So that the starting link starts as "stage1.php?c=&y=&m=" and each time they click on the drop down box, it just changes what " C, Y or M " Equals. So that they don't have to select things in order.

Erm, if this isnt clear anough please let me know. *really stuck*

elaborate more

There is a link called "Company" The user clicks on it, and it takes them to index.php?c=1

Then there is a link called "Month" The user clicks on it, and it takes them to index.php?c=1&m=2

Then there is a link called "Year" The user clicks on it, and it takes them to index.php?c=1&m=2&y=3

But then if the click a link, which makes "c=2" it keeps m=2, and y=3.

So that link would take them to index.php?c=2&m=2&y=3.

So instead of having the "Company" link being <a href="index.php?c=1">Company</a>
and "Year" link being <a href="index.php?c=1&m=2&y=3">Year</a>

They are in this form
(% being any character/number)
<a href="index.php?c=%&m=%&y=%">Company</a>
<a href="index.php?c=%&m=%&y=%">Month</a>
<a href="index.php?c=%&m=%&y=%">Year</a>

for example, if i had two links that one made c=1 and the other made c=2
and have one link for month, so that the C value could change without it being pre-set within the Href.

Thankyou

Cool, I've fixed the problem.