With no page DTD defined, IE does something strange when doing movement and you get odd jumping in things like the accordion. I know you can define a DTD but within SharePoint this is not always possible. Therefore, when I implemented ddacordion 1.7 I get jummping with v1.4.2 of jQuery in IE 7.

The solution is simple.

Change line 5795 in the simple hide function from:

this.custom(this.cur(), 0);

to

this.custom(this.cur(), this.prop=="width"||this.prop=="height"?1:0);

This mod has already been added on line 5782, it just needs to be added here too.