How to restore mach_kernel after I deleted it? OS 10.5.8

Hi all,

I stupidly deleted the mach_kernel file and didn't realise its importance until I started the laptop up to find it would not reboot. I am running 10.5.8. I have been advised that in theory the deleted file should still be sitting in my recycle bin, is that right? If this is the case can I connect my hard drive to another computer and simply drag and drop it back to its location. Will this work and then allow me to start up the mac as normal.

Any help that can be passed over would be much appreciated. I am a computer and for that matter mac novice and I'm not being modest so please go easy.