Conflict can and will be fixed.
It's usually the body ONLOAD event handler.
Resolving this conflict is simple.

EXAMPLE #1:
SCRIPT 1: <body onload="dothis()">
SCRIPT 2: <body onload="dothat()">
RESOLUTION: <body onload="dothis();dothat()">

EXAMPLE #2:
SCRIPT 1: <body onload="dothis()">
SCRIPT 2: window.onload=dothat()
RESOLUTION: <body onload="dothis();dothat()">

EXAMPLE #3:
SCRIPT 1: window.onload=dothis
SCRIPT 2: window.onload=dothat
RESOLUTION: <body onload="dothis();dothat()">