$(document).ready(function(){

  
  

    
    // Using multiple unit types within one animation.
    $("#v").click(function(){
    	  $("#articles").width(articlesWidth);
    	var p = $("#block");
     	var position = p.position();
    //alert(position.left);
    		if(position.left != n){
      $("#block").animate({ 
        left: "-=242px"
      }, 250 );
    }
    });
    
    
     $("#z").click(function(){
     	  $("#articles").width(articlesWidth);
     		var p = $("#block");
     		var position = p.position();
     		//alert(position.left);
          
   			if(position.left != 0){
      			$("#block").animate({ 
        		left: "+=242px"
      	}, 250 );
   			}
     });

  });