function changeImage (image, id) {
	
	for ( x = 1; x <= 5; x++ ) {
		if ( document.getElementById( id + "_" + x ) ) {
			document.getElementById( id + "_" + x ).className = "hidden_image";
		}	
	}
	
	var zoomAs = document.getElementById("zoom").getElementsByTagName("a");
	for ( x = 0; x < zoomAs.length; x++ ) {
		if (zoomAs[x]) {
			zoomAs[x].className = "hidden_image";
		}
	}
		
	document.getElementById( id + "_" + image ).className = "visible_image";
	document.getElementById("zoomimage_"+ id + "_" + image).className = "visible_image";
	
	for ( x = 1; x <= 5; x++ ) {
		if ( document.getElementById( id + "thumb_" + x ) ) {
			document.getElementById( id + "thumb_"+ x ).className = "image_small";
		}	
	}
	
	
	document.getElementById( id + "thumb_" + image ).className = "image_small_current";
	
	return false;
	
}


function nextImage(id) {
	
	var current = document.getElementsByClassName( "visible_image" );
	var next = current[0].id.substr( current[0].id.length - 1);
	next = parseInt(next) + 1;
	
	if (document.getElementById( id + "_" + next ) ) {
		changeImage(next,id);
	}
	
}

function prevImage(id) {
	
	var current = document.getElementsByClassName( "visible_image" );
	var next = current[0].id.substr( current[0].id.length - 1);
	next = parseInt(next) - 1;
	
	if (document.getElementById( id + "_" + next ) ) {
		changeImage(next,id);
	}
	
}

function show_grundrisse() {
	
	document.getElementById( "gal_grundrisse" ).style.display = "block";
	document.getElementById( "gal_ansichten" ).style.display = "none";
	
	document.getElementById( "ansichten" ).className = "first";
	document.getElementById( "grundrisse" ).className = "sel";
	
	document.getElementById( "grundrisse_detailimg" ).style.display = "block";
	document.getElementById( "ansichten_detailimg" ).style.display = "none";
	
	for ( x = 1; x <= 5; x++ ) {
		if ( document.getElementById( "detailbild_" + x ) ) {
			document.getElementById( "detailbild_" + x ).className = "hidden_image";
		}	
	}
	
	changeImage(1, "grundriss");
	
}

function show_ansichten() {
	
	document.getElementById( "gal_grundrisse" ).style.display = "none";
	document.getElementById( "gal_ansichten" ).style.display = "block";
	
	document.getElementById( "ansichten" ).className = "sel";
	document.getElementById( "grundrisse" ).className = "desel";
	
	document.getElementById( "grundrisse_detailimg" ).style.display = "none";
	document.getElementById( "ansichten_detailimg" ).style.display = "block";
	
	for ( x = 1; x <= 5; x++ ) {
		if ( document.getElementById( "grundriss_" + x ) ) {
			document.getElementById( "grundriss_" + x ).className = "hidden_image";
		}	
	}
	
	
	changeImage(1, "detailbild");
	
}

function goTo(url) {
	
	if (url != "-") {
		
		window.location.href = url;
		
	}
	
}