Java Script Help

I am using java script for a menu on my "homepage". All of the files on on my computer instead the the web, because I use it for my home network.

I am wanting to open a new web page that is in the same directory as everything else.

Does anyone know the correct command to put in here?

Here is the sub menu that I am working on. I need to open the Bills.htm document.

with(milonic=new menuname("Miscellanous")){
margin=4;
style=submenuStyle;
aI("text=E mail;url=http://www.mail.com;");
aI("text=File Hippo;url=http://www.filehippo.com;");
aI("text=XM Radio;url=http://www.xmradio.com;");
aI("text=Red Box;url=http://www.redbox.com/Titles/AvailableTitles.aspx#Genre&page=1&sort=1&titleName=&pageSize=10&genreID=-1;");
aI("text=Bills;url=file://localhost/D:/Website/Bills.htm;");
}