Oki, so I did that. I downloaded "portalgun 1.2.5v1". After downloading it I placed it in the Mod folder (still zipped), when i launched Tekkit it crashed (still saying 41 mods loaded at the top of the report), so i went back and read the "readme" file in the portal mod. It said I had to put the extracted portalgun folder into the mod folder, so i deleted the zipped one and replaced it with the extracted folder. Then I tried to launch Tekkit, but it crashed again. Only this time it said "42 Mods loaded" at the top of the report, portalgun beeing one of them.
Thanx for the help :)