I ran into this problem once before and I couldnt put 2 onload functions within the same page. Then I read that you cant have 2 body onload tags....so the answer to your question is...I dont think that you can.
onLoad only fires once. When the page is finished loading.<BR><BR>If you need to call two functions, then it's simple. Just put a semi-colon inbetween them... ie.<BR><BR><body onload="firstInit();secondInit()"></body><BR><BR>That code will call firstInit() first, then secondInit() second.<BR><BR>If you didn't want to do that, you could just make a call to your second function in the first function.