function zoom(arg){
	var pos = arg.lastIndexOf('/');
	var arg1 = arg.substr(pos+1);
	window.open('/zoom.html?img='+arg1,'hovercraft_zoom','width=570, height=430');
}


function carica(w,h){

	var imgdir = './foto/';
	var url = document.location+'';
	var pos = url.indexOf('img=');
	
	var img = url.substr(pos+4);
	var zoom = new Image(w,h);
	zoom.src = imgdir+img;
	document.images[0].src = zoom.src;
	
}

function caricavanair(w,h){

	var imgdir = './foto/';
	var url = document.location+'';
	var pos = url.indexOf('img=');
	
	var img = url.substr(pos+4);
	var zoom = new Image(w,h);
	zoom.src = imgdir+img;
	document.images[0].src = zoom.src;
	
}

function opacity(id, opacStart, opacEnd, millisec) {
    //speed for each frame
    var speed = Math.round(millisec / 100);
    var timer = 0;

    //determine the direction for the blending, if start and end are the same nothing happens
    if(opacStart > opacEnd) {
        for(i = opacStart; i >= opacEnd; i--) {
            setTimeout("changeOpac(" + i + ",'" + id + "')",(timer * speed));
            timer++;
        }
    } else if(opacStart < opacEnd) {
        for(i = opacStart; i <= opacEnd; i++)
            {
            setTimeout("changeOpac(" + i + ",'" + id + "')",(timer * speed));
            timer++;
        }
    }
}

function changeOpac(opacity, id) {
    var object = document.getElementById(id).style;
    object.opacity = (opacity / 100);
    object.MozOpacity = (opacity / 100);
    object.KhtmlOpacity = (opacity / 100);
    object.filter = "alpha(opacity=" + opacity + ")";
}

function currentOpac(id, opacEnd, millisec) {
    //standard opacity is 100
    var currentOpac = 100;
    
    //if the element has an opacity set, get it
    if(document.getElementById(id).style.opacity < 100) {
        currentOpac = document.getElementById(id).style.opacity * 100;
    }

    //call for the function that changes the opacity
    opacity(id, currentOpac, opacEnd, millisec)
}