Different jQuery to old version of IE

old_IE_conditional.js

// Found this nice function on StackOverflow, which you don't necessarily need.
jQuery.fn.exists = function(){
    return jQuery(this).length>0;
}

// Example jQuery Code
$(document).ready(function()
{ 
	// Hover function which gives different javascript to older IE
	$("table.inv-table .inv-link").hover(function(){
		if ( $("html.lt-ie9").exists() ) { 
			$('span.hov',this).show();
		} else {
			$('span.hov',this).fadeTo(250, 1.0);
		}
	}, function(){
		if ( $("html.lt-ie9").exists() ) { 
			$('span.hov',this).hide();
		} else {
			$('span.hov',this).fadeTo(400, 0);
		}
	});
});