$(document).ready(function(){
var counter=0;
var counter1=0;
<!---------for landing page------->
 $("a#next2").click(function (){
    if(counter<3){
        $("div#thumbs ul").animate({"left": "-=892px"});
        counter=counter+1;
    }
  });

    $("a#prev2").click(function (){
    if(counter>0) {
        $("div#thumbs ul").animate({"left": "+=892px"});
        counter=counter-1;
    }
    });

 <!---------end landing page-------> 

});