Dual Booting Leopard and Windows Xp?

Forgive me for I am new here and my freind told me to come here. I am sorry if you already have an answer anways down to the point I already have windows xp and I want this done in an easy way with out major harm of my computer I'm not really sure how to create a partion or do anything. I don't want to have to format anything. What programs will I need can someone walk me through it because there is different ways but I'm not sure about any of them does my system specs matter?

without format u cant do anything.........

good luck....