hello there. i have a question.

i have a problem with my sidebar.

i have tried to put a backgroundimage by using the parametersettings for the template. but doing so doesn't allow me to make it repeat itself, wich is necesary. so i made the background for the left sidebar pink just so that i would be able to find it in the css pages so that i manualy could add a backgroundimage. but i can't find it anywhere. where can i make this change ? in wich templatefile ,