var wid=null;

function popup(i,w,h,e) {
	var w1=w+10;
	var h1=h+10;
	var mx=e.screenX;
	var my=e.screenY;
	var sh=screen.height;
	var sw=screen.width;
	var ox=mx+50;
	var oy=my-(h/2);
	if ((oy+h+75) > sh) { oy=sh-h-75 }
	if (oy < 5) { oy=5 }
	if ((ox+w+30) > sw) { ox=sw-w-30 }
	if ((ox < (mx+10))&&((mx-w-60) > -1)) { ox=mx-w-60 }
	if (ox < 5) { ox=5 }
	tidy();
	wid=window.open('popup.html?image='+i,'popwin','width=' + w1 + ',height=' + h1 + ',screenX='+ ox +',screenY='+ oy +',top='+ oy +',left='+ox);
	}

function tidy() {
	if ((wid)&&(wid.location)&&(!wid.closed)) { wid.close(); }
	}