Some jQuery usage notes for useful/common stuff:
To run script when the browser reaches ready state:
$(document).ready(function(){
//do stuff here
});
Detecting browser type, eg:
if ($.browser.webkit){
alert( "this is webkit!" );
}
Valid values are webkit, opera, msie, mozila
See here.
Change attribute value of an element:
$('#elementId').attr('attributename', 'new attribute value');
More, see here.