I have a sidebar (right sided iframe) and when i click on a link in it, it opens a new window in IE8, (in firefox it open a new tab). What do i need to do to open links in I
You need to use the target="_blank" attribute to make links open in a new window or tab. Where the link actually opens is up to the browser settings. So if you have Tools > Internet Options > Tabbed Browsing Settings > "Always open pop-ups in new tabs" selected, a target="_blank" link will open in a new tab. Note that this type of link will open in a new window by default on most browsers.
Your settings look right, just loose the "Target" attribute in the html
The target attribute defines where the linked document will be opened.
Just a short observation, IE (all versions) will not open a link with invalid ULR address. For example a missing slash (http:/domain.ext). It will work on other browsers tho.