// JavaScript Document

$('html').addClass("js");//fouc
$(document).ready(function(){
	
	$("#menu a img").hover(
       function()
 		{
  			this.src = this.src.replace("_off","_on");
 		},
		function()
 		{
			this.src = this.src.replace("_on","_off");
 		}

    ); 
var sstotal = $("ul#ssGraphics li").length;
var ssbase = 1;

$("#arrowNext").click(function () { 
    if (ssbase < sstotal){
		$("li[id='graphic_" +ssbase+ "']").hide();
		ssbase++;
		$("li[id='graphic_" +ssbase+ "']").show();
		checkArrows();
	}
    });
$("#arrowPrev").click(function () { 
    if ((ssbase == sstotal) || (ssbase > 1) ){
		$("li[id='graphic_" +ssbase+ "']").hide();
		ssbase--;
		$("li[id='graphic_" +ssbase+ "']").show();
		checkArrows();
	}
    });

function checkArrows() {
if (ssbase == 1) { 
	$("#arrowNext").css("visibility", "visible");
	$("#arrowPrev").css("visibility", "hidden");
}
if (ssbase == sstotal) { 
	$("#arrowNext").css("visibility", "hidden");
	$("#arrowPrev").css("visibility", "visible");
}
if ((ssbase < sstotal) && (ssbase > 1)){ 
$("#arrowNext").css("visibility", "visible");
	$("#arrowPrev").css("visibility", "visible");	
}
};
//////////////////
		
	 });//end document load function