var ie=document.all
var ns6=document.getElementById&&!document.all

function ietruebody()
{
    return (document.compatMode && document.compatMode!="BackCompat" && !window.opera)? document.documentElement : document.body
}

function enlarge(which, e, position, imgwidth, imgheight)
{
    if (ie||ns6)
    {
        crossobj=document.getElementById? document.getElementById("showimage") : document.all.showimage
        chiudi=document.getElementById? document.getElementById("dragbar") : document.all.dragbar
        if (position=="center")
        {
            pgyoffset=ns6? parseInt(pageYOffset) : parseInt(ietruebody().scrollTop)
            horzpos=ns6? pageXOffset+window.innerWidth/2-imgwidth/2 : ietruebody().scrollLeft+ietruebody().clientWidth/2-imgwidth/2
            vertpos=ns6? pgyoffset+window.innerHeight/2-imgheight/2 : pgyoffset+ietruebody().clientHeight/2-imgheight/2
            if (window.opera && window.innerHeight) //compensate for Opera toolbar
                vertpos=pgyoffset+window.innerHeight/2-imgheight/2
            vertpos=Math.max(pgyoffset, vertpos)
        }
        else
        {
            var horzpos=ns6? pageXOffset+e.clientX : ietruebody().scrollLeft+event.clientX
            var vertpos=ns6? pageYOffset+e.clientY : ietruebody().scrollTop+event.clientY
        }
        vertpos += 10;
        vertposImg = vertpos + 16;
        crossobj.style.left = horzpos + "px";
        crossobj.style.top = vertposImg + "px";
        crossobj.style.display = "block";
        crossobj.style.width = imgwidth+4;
        crossobj.style.height = imgheight+4;
        crossobj.src = which;
        //pulsante di chiusura
        chiudi.style.display = "block";
        chiudi.style.left = horzpos + "px";
        chiudi.style.top = vertpos + "px";
        chiudi.style.width = imgwidth+4+4;// il 4 indica i pixel del bordo,4 per il margine dell'iframe
        chiudi.style.height = 16;

        return false
    }
    else //if NOT IE 4+ or NS 6+, simply display image in full browser window
        return true
}

function closepreview()
{
    crossobj.style.display="none";
    chiudi.style.display="none";
}

function drag_drop(e)
{
    if (ie&&dragapproved)
    {
        crossobj.style.left=tempx+event.clientX-offsetx+"px"
        crossobj.style.top=tempy+event.clientY-offsety+"px"
        chiudi.style.left=tempx+event.clientX-offsetx+"px"
        chiudi.style.top=tempy+event.clientY-offsety-16+"px"
    }
    else if (ns6&&dragapproved)
    {
        crossobj.style.left=tempx+e.clientX-offsetx+"px"
        crossobj.style.top=tempy+e.clientY-offsety+"px"
        chiudi.style.left=tempx+e.clientX-offsetx+"px"
        chiudi.style.top=tempy+e.clientY-offsety-16+"px"
    }
    return false
}

function initializedrag(e)
{
    if (ie&&event.srcElement.id=="dragbar"||ns6&&e.target.id=="dragbar")
    {
        offsetx=ie? event.clientX : e.clientX
        offsety=ie? event.clientY : e.clientY

        tempx=parseInt(crossobj.style.left)
        tempy=parseInt(crossobj.style.top)

        dragapproved=true
        document.onmousemove=drag_drop
    }
}

document.onmousedown=initializedrag
document.onmouseup=new Function("dragapproved=false")