var slide = {
	horpos : 0,
	verpos : 0,

	up : function(obj) {
		if(slide.verpos==0) return;
		slide.verpos += 87;
		slide.toverpos(obj);
	},

	down : function(obj,pics) {
		if(pics <= 4) return;
		if(slide.verpos==(pics-4)*(-87)) return;
		slide.verpos -= 87;
		slide.toverpos(obj);
	},

	left : function(obj) {
		if(slide.horpos==0) return;
		slide.horpos += 132;
		slide.tohorpos(obj);
	},

	right : function(obj,pics) {
		if(pics <= 4) return;
		if(slide.horpos==(pics-4)*(-132)) return;
		slide.horpos -= 132;
		slide.tohorpos(obj);
	},

	toverpos : function(obj) {
		document.getElementById(obj).style.marginTop = slide.verpos+"px";
	},

	tohorpos : function(obj) {
		document.getElementById(obj).style.marginLeft = slide.horpos+"px";
	}
}