core.js

//alert(String.fromCharCode(event.keyCode));

var STRING_EMPTY = "";
var highlightCssClass = "nomouse-chrome-extension-highlight";
var pointer = -1;
var selectedUrl = STRING_EMPTY;

var KEY_ARROW_DOWN = 40;
var KEY_ARROW_RIGHT = 39;
var KEY_ARROW_LEFT = 37;
var KEY_ARROW_UP = 38;
var KEY_SPECIAL_ENTER = 13;

document.onkeydown = function (e) {
	$("span#knavm").remove()  // Remove default and buggy google keyboard navigation

    if (e.shiftKey) {
    
    	//find all search results
    	var eles = $("li.g");
        var elementsCount = eles.length;
        
        if (e.keyCode == KEY_SPECIAL_ENTER && selectedUrl != STRING_EMPTY) {
        
        	//shift + enter = go to highlighted
        	window.location = selectedUrl;
        
        } else if (e.keyCode == KEY_ARROW_RIGHT) {
			window.location = $(".navend:last a").attr("href");
        	//go to next page
        } else if (e.keyCode == KEY_ARROW_LEFT) {
			//go to previous page
			if ($("td.cur").text()!=1) //if we are on the first page, we can't go back
				window.location = $(".navend:first a").attr("href");
        }else if (e.keyCode == KEY_ARROW_DOWN || e.keyCode == KEY_ARROW_UP) {
           
        	//turn off highlight for previous item
            eles.eq(pointer).removeClass(highlightCssClass);
						
            //highlight current item, go out of index and hide highlight 
			//when user navigates over the limit
            if (e.keyCode == KEY_ARROW_DOWN && pointer != elementsCount) {
            	eles.eq(++pointer).addClass(highlightCssClass);
            } else if (e.keyCode == KEY_ARROW_UP && pointer != -1) {
            	eles.eq(--pointer).addClass(highlightCssClass);
            }
      
            //if no visible highlight, reset selectedUrl
            if(pointer==-1 || pointer == elementsCount){
            	selectedUrl = STRING_EMPTY;
            }else{
            	selectedUrl = eles.eq(pointer).find("a[href]:first").attr("href");
           }
		}
    
    }//shift
    
};