var n = 8;
var f = false;
var b = new Array;

function prel(){
	if(document.images) {
		for(i=1;i<=n;i++){
		  str = 'buttons/b' + i + '_o.gif';
		  b[i-1] = new Image();
		  b[i-1].src = str;
		  }
		f = true;
 	}
}

function on(im){
	if (document.images && (f == true)) {document.images[im].src="buttons/"+im+"_o.gif";}
}

function off(im){
	if (document.images && (f == true)) {document.images[im].src = "buttons/"+im+".gif";}
}

var i=0;
var classes = new Array(1,2,3);

function changeTop() {
		cn = document.getElementById('bodyContainer').className;
		i = cn.replace(/page/, '');
		setTimeout("changeBodyClass()", 10000);
}

function changeBodyClass() {
	if(i>=classes.length) {
		i=0;
	}
	document.getElementById('bodyContainer').className='page' + classes[i++];
	changeTop();
}