/* 

navigation by peter edwards for rightfoot creative

*/

    $(document).ready(function() {
                    var nextPage = $("#next_page_link")
                    var prevPage = $("#previous_page_link")
                    var downPage = $("#down_page_link")
                    var upPage = $("#up_page_link")
                    nextUrl = nextPage.attr("href")
                    prevUrl = prevPage.attr("href")
                    downUrl = downPage.attr("href")
                    upUrl = upPage.attr("href")
           
           document.onkeydown = function(e)
                {
                if (!e) e=window.event;
    	        var $LEFT_ARROW = 37;
    	        var $RIGHT_ARROW = 39;
    	        var $UP_ARROW = 38;
    	        var $DOWN_ARROW = 40;
    		
                    if (e.keyCode == $RIGHT_ARROW) {
                        e.preventDefault();
                        window.location = nextUrl;
                    } else if (e.keyCode == $LEFT_ARROW) {
                        e.preventDefault();
                        window.location = prevUrl;           
                    } else if (e.keyCode == $DOWN_ARROW) {
                        e.preventDefault();
                        window.location = downUrl;           
                    } else if (e.keyCode == $UP_ARROW) { 
                        e.preventDefault();
                        window.location = upUrl;         
                    } else {
					return;
                    }
                  }
             });