function displayimage(imagenumber)
{
	
	
	
	if ("+"==imagenumber)
	{
		currentimage++;	
	}
	else if ("-"==imagenumber)
	{
		currentimage--;	
	}
	else
	{
		currentimage = imagenumber;
	}	
	
	
	document.getElementById('gallery').className = 'dimmed';
	document.getElementById('overlay').style.display = 'block';
	document.getElementById('image_holder').innerHTML=document.getElementById('hidden_image_'+currentimage).innerHTML;
	document.getElementById('title_text_holder').innerHTML=document.getElementById('title_text_'+currentimage).innerHTML;
	document.getElementById('description_text_holder').innerHTML=document.getElementById('description_text_'+currentimage).innerHTML;
	
	
	
	document.getElementById('next').style.display = 'block';
	document.getElementById('previous').style.display = 'block';
	
	if ( (currentimage+1) == numberImages)
	{
		document.getElementById('next').style.display = 'none';
	}
	else if (0 == currentimage)
	{
		document.getElementById('previous').style.display = 'none';
	}
	else
	{
		document.getElementById('next').style.display = 'block';
		document.getElementById('previous').style.display = 'block';
	}
	
	if (1 == numberImages)
	{
		document.getElementById('next').style.display = 'none';
		document.getElementById('previous').style.display = 'none';
	}
	
}

function hideimage(  )
{
	document.getElementById('gallery').className = 'backtonormal';
	document.getElementById('overlay').style.display = 'none';
}