Help with Picture Viewers as Reference Window

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I'm currently trying out drawing girls using references ....

Anyone knows a program that can "stay on top" picture viewer on top of programs? Something like a built-in window image viewer but with a stay on top feature so that I don't have to "alt-tab" during a sketch ... I'm currently using Acdsee and alt tabbing lol .....

Edit: O.O I just saw a Freeware for it lol ... " Irfanview " it has a nice stay on top feature .... so I guess this is resolved but you guys can post other programs similar to this one ... I'll go and give it a test =)