function Prev()
	   {
	    if (i < 1 )
		 i = arr.length-1;
		else
		 i--;
		document.getElementById('sofa_new').innerHTML = '<a href="'+arr[i][0]+'"><img src="'+arr[i][1]+'" /></a>';
	   }
	   
	   function Next()
	   {
	    if (i < (arr.length-1) )
		 i++;
		else
		 i = 0;
		document.getElementById('sofa_new').innerHTML = '<a href="'+arr[i][0]+'"><img src="'+arr[i][1]+'" /></a>';
	   }