new browser from webtemplate WAD3.5 version

Hi experts

I have one webtemplate in Production on which we have button called 'Sales'...When I click on this,the present window will be refreshed with sales drilldown data....but my user donot want like this...when he clicks on 'Sales'..he wants sales drilldown data to open in new window...For this,I know that I have to change HTML coding but I donot know which commands I need to add ...we are using WAD3.5 version.....I will be thankful for the guidance.......

Regards,

P Olin.