Opening a Window with JavaScript

I want to have a link on a php page that when opened, has to be closed in order to move on. I have done this on pages using a button and JavaScript as follows: <input name="btnHelp" type="button" value="Help" onClick="MM_openBrWindow('help.html','', 'toolbar=no, status=yes, scrollbars=no, resizable=no, width=790, height=600')";"> When the button is clicked, the form is *NOT* submitted - this is what I want. However, if I use an anchor, the form is submitted. Is there a way to prevent this? Here is the code I tried: <a href="#" onClick="MM_openBrWindow('legal.php', '', 'toolbar=no, status=yes, scrollbars=no, resizable=no, width=790, height=600')";"> When the above is executed, the page is submitted, and I do not want that.... Todd --