I don't know about Palm development so I can't help you out in detail. Mojo however is based on Prototype. Prototype and JQuery crash because they have identical function names. That's where the noConflict plugin comes in. You can read up on it here and get it here. That's about all I can tell you about it - maybe somebody else can take you through the process step by step.
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james_womack
On
Import Mojo
Import jQuery
Create a Script block that contains jQuery.noConflict();
Follow with your normal jQuery except using 'jQuery' instead of '$'
Check out this question, especially the comments.
Edit in response to the comments:
I don't know about Palm development so I can't help you out in detail. Mojo however is based on Prototype. Prototype and JQuery crash because they have identical function names. That's where the noConflict plugin comes in. You can read up on it here and get it here. That's about all I can tell you about it - maybe somebody else can take you through the process step by step.