function scroller(div, prefix) { 

    var local 			= this;
	this.currentBloc 	= 0;
	this.prefix 		= prefix;
	this.blocs     		= $(div).childElements();
	this.totalBlocs 	= this.blocs.length;

    this.start 			= function () {
		if(this.currentBloc == this.totalBlocs) {
			this.currentBloc = 1;
		} else {
			this.currentBloc = this.currentBloc+1;
		}
		
		if (this.currentBloc > 1) {
			Effect.SlideUp(this.prefix+'-'+(this.currentBloc-1));
		}
		
		for (i = 0; i < this.totalBlocs; i++) {
			if ((i+1) == this.currentBloc) {
				Effect.SlideDown(this.prefix+'-'+this.currentBloc);
			} else {
				$(this.prefix+'-'+(i+1)).hide();
			}
		}
		
		this.timeout 	= setTimeout(function(){local.start();}, 5000);
    }
}