belts

I have a 98 rodeo and on start up the belts squeal loud enough to wake the neighbors what can i do???

Replace the belt (under 20 bucks).

Replace the tensor.

Replace the idler pulley (common place from where it will squeal; 15 bucks).

link to idler pulley write-up:
http://www.geocities.com/endre_rl/isuzufaq.htm?200522#faq69