function clip() {
 	// width of the banner container
 	var contWidth = 150;
 	// height of the banner container
 	var contHeight = 880;

 	var id1 = document.getElementById('slideA');
 	var id2 = document.getElementById('slideB');
 	var height = id1.offsetHeight;

 	id1.style.top = parseInt(id1.style.top)-1 + 'px';

 	document.getElementById('slideCont').style.height = contHeight + "px";
 	document.getElementById('slideCont').style.clip = 'rect(auto,'+ contWidth +'px,' + contHeight +'px,auto)';
 	id2.style.display = '';
 	if(parseFloat(id1.style.top) == -(height/2)) {
  		id1.style.top = '0px';
 	}
 	setTimeout(clip,50)
}

function addLoadEvent(func) {
  var oldonload = window.onload;
  if (typeof window.onload != 'function') {
    window.onload = func;
  } else {
    window.onload = function() {
      if (oldonload) {
        oldonload();
      }
      func();
    }
  }
}

addLoadEvent(function() {
  clip();
});