Depending on which menu it is that you are (or trying to figure this out on), you should simply be able to get rid of the onclick part in the link itself.
For example (anylink menu)
Simply get rid of the part in red and that should allow you to click on the link. Then, the link (once clicked of course) would take you to whatever page you place in the "href" attribute.
<a href="test.html" onClick="return clickreturnvalue()" onMouseover="dropdownmenu(this, event, menu1, '150px')" onMouseout="delayhidemenu()">Web Design</a>
Hope this helps.
PS: if you want resolution to the menu you are using (want a solution for the question in this thread), please post a link to either the script or a webpage with the menu on it.