function popup(url,name,width,height,position,wplus,hplus,focus,left,top,menubar,status,toolbar,scrollbar,resizable,scrx,scry,directories,loc) {
	if ( !url ) return false;
	if ( !name ) name = 'popupWin';
	if ( !width ) width = '';
	if ( !height ) height = '';
	if ( !directories ) directories = 'no';
	if ( !loc ) loc = 'no';
	if ( !menubar ) menubar = 'no';
	if ( !status ) status = 'no';
	if ( !toolbar ) toolbar = 'no';
	if ( !scrollbar ) scrollbar = 'no';
	if ( !resizable ) resizable = 'no';
	if ( !scrx ) scrx = '100';
	if ( !scry ) scry = '100';
	if ( !left ) left = '100';
	if ( !top ) top = '100';
	if ( wplus ) width  += wplus;
	if ( hplus ) height += hplus;

	if ( position == '1' ) {
		var winleft = (screen.width - width) / 2;
		var wintop = (screen.height -  height) / 2;
	} else {
		var winleft = left;
		var wintop = top;
	}

    var popupWin = window.open(url,name,'width='+width+'px,height='+height+'px,left='+winleft+',top='+wintop+',menubar='+menubar+',status='+status+',toolbar='+toolbar+',scrollbars='+scrollbar+',resizable='+resizable+',screenX='+scrx+',screenY='+scry+'directories='+directories+',location='+loc);

	if ( focus ) popupWin.focus();
}

function changeImage(img, img_src) {
  img.src = img_src;
}

function show_image(img,width,height) {
		document.getElementById('large_image').src = 'gfx/gallery/tn/'+img+'.jpg';
		document.getElementById('large_image').className = 'popup:gfx/gallery/'+img+'.jpg:'+width+':'+height;
}