The following function unselects (or deselects) all text on a web page. Include it in your Javascript and just call jQuery.unselectAll().
jQuery.unselectAll = function() { if (document.selection && document.selection.empty) { document.selection.empty(); } else if (window.getSelection) { var sel= window.getSelection(); if(sel && sel.removeAllRanges) sel.removeAllRanges(); } }