var catimg = new Array();
var okLoad = false;

function init()
{
  for(j=1;j<3;j++)
    for(i=1;i<11;i++)
      {
        catimg[2*(i-1)+j-1]=new Image();
		if(j==1)
	  	    catimg[2*(i-1)+j-1].src="images/cat" + i +".gif";
		else
	  	    catimg[2*(i-1)+j-1].src="images/cat_" + i +".gif";
  	  }
 okLoad = true;
}

function menucat(imgnum, number)
{
	if(!okLoad)
	  return;
	document.images["cat"+imgnum].src = catimg[2*(imgnum-1)+number-1].src;
}