I've created a search form and wanted and want to use a graphic for the submit button, rather than the 'normal submit button'. I've got it to work ok but for some reason I seem to be passing two unwanted variables which I don't want - and don't know where they come from!

I checked out a few other sites which uses graphics for submit buttons and the same thing happens. The two variables are x & y and there values seem to change at will.

Whats going on and how can I stop these variables being passed?

Heres an example of the sort of thing thats happening - seems very strange!!!!!