Here is a sample page extension making use of Jquery 1.4.2 minified.
Process
Load the Load Setup tab
Click Page Extensions
Click on Add
Enter a Name
Enter the Page that should be affected (i.e. ticket/add)
Enter the following sample script
Code Block language js var ticketTitle = jQuery("input").filter(function(index) {return (this.id == 'Ticket.Title')}); var ticketComment = jQuery("textarea").filter(function(index) {return (this.id == 'Comment')}); ticketTitle.attr('value', 'Title jQuery Test'); ticketComment.attr('value', 'Comment jQuery Comment');
Click Save