var current_image=-1;

function switch_image(dir, i, sel)
{
	if (current_image==-1)
	{
		current_image=sel;
	}
	if (i != current_image)
	{
		var imgel=document.getElementById('gallery_img');
		imgel.src=dir+'/'+i+'.jpg';
		var currentel=document.getElementById('photo-gallery-'+current_image);
		currentel.src=dir+'/'+current_image+'t.jpg';
		var thumbel=document.getElementById('photo-gallery-'+i);
		thumbel.src=dir+'/'+i+'to.jpg';
		var noel=document.getElementById('gallery_no');
		if (i < 10)
			noel.innerHTML='0'+i;
		else
			noel.innerHTML=i;
		current_image=i;
	}
	return false;
}