document.zoomlevel=['http://www.abrasivipiccinato.com/images/map1.gif','http://www.abrasivipiccinato.com/images/map2.gif','http://www.abrasivipiccinato.com/images/map3.gif'];
document.zoometer_image=['http://www.abrasivipiccinato.com/images/zoom1.gif','http://www.abrasivipiccinato.com/images/zoom2.gif','http://www.abrasivipiccinato.com/images/zoom3.gif'];
zoomin=function(){
	if(window.plan.zoom<document.zoomlevel.length-1){
		window.plan.src=document.zoomlevel[++window.plan.zoom];
		window.zoometer.src=document.zoometer_image[window.plan.zoom];
	}
};

zoomout=function(){
	if(window.plan.zoom>0){
		window.plan.src=document.zoomlevel[--window.plan.zoom];
		window.zoometer.src=document.zoometer_image[window.plan.zoom];
	}
};
old_onload=window.onload;
window.onload=function(){
	try{old_onload();}catch(e){}
	this.plan = document.getElementById('plan');
	this.zoometer = document.getElementById('zoometer');
	this.plan.zoom=0;
	document.getElementById('meno').onclick=zoomout;
	document.getElementById('piu').onclick=zoomin;
};