function cj_chg_img(id, value) {
	picture = new Image();
	picture.src = value;
	window.document.images[id].src = picture.src;
}

function cj_show_img(value) {
	picture = new Image();
	picture.src = 'img/gallery/'+value;
	window.document.images['gallery_image'].src = picture.src;
}

function set_pos() {
	w = window.document.images['gallery_image'].width;
	h = window.document.images['gallery_image'].height;
	if(h<360){
		top = 125 + Math.round((360 - h) / 2);
		document.getElementById('gallery_image').style.top = top+'px';
	}
	else{
		document.getElementById('gallery_image').style.top = '125px';
	}
	if(w<480){
		left = 79 + Math.round((480 - w) / 2);
		document.getElementById('gallery_image').style.left = left+'px';
	}
	else{
		document.getElementById('gallery_image').style.left = '79px';
	}
}