HDMI Switch Question

[GamertypeS]

Hi, I was wondering if it is possible to get a hdmi switch and hook it up so i can go back and forth using a computer and a HD cable box. My monitor or computer doesnt like it when i unplug the dvi cable then try to plug it back in because i get a blank screen. I also don't want to have to shutdown and restart the computer everytime i wanna go from one to the other. Kind of a switch on the fly but still give my computer a signal somehow so i can get it back without having to restart the computer. I just bought a 24 dell monitor with HDCP enabled. I have not tested any switchers so i was hoping someone would know of a switcher that is able to switch back and forth between computer and hd cable box without having to restart the computer every time you wanna go from one to the other. Any help would be greatly appreciated. Thank you.

~Regards
Marc