var enableJS = true;
var upId= 'up';
var preloaded = new Array();
function preloadImages() {
    for(i=0; i<arguments.length; i++){
    	preloaded[i]=new Image; 
		preloaded[i].src=arguments[i];
	}
}

function move(id){
	if(document.viewport.getScrollOffsets().top==0){
			$(id).setStyle({
			visibility:'hidden'
		});
	}else{
		$(id).setStyle({
			visibility:'visible'
		});
	}
  	pos = document.viewport.getHeight() + document.viewport.getScrollOffsets().top -34;
	$(id).setStyle({
		top: pos +"px"
	});
}