function showLayer( layer_id ) {
		document.getElementById(layer_id).style.visibility = "visible"
	}

	function hideLayer( layer_id ) {
		document.getElementById(layer_id).style.visibility = "hidden"
	}
	
	function roll_over(img_name, img_src) {
   		document[img_name].src = img_src;
	}
	
	function getVisibility( layer_id ) {
		  if( document.getElementById(layer_id).style.visibility == "visible" ) {
		  return true
		}
		return false
	}

	function newLayer( layer_id ) {
		if( getVisibility( layer_id ) == false ) {
			showLayer( layer_id )
		}
		else
			hideLayer( layer_id )
	}
	
	function showProjekte( layer_id ) {
		if( getVisibility( layer_id ) == false ) {
			showLayer( 'PROJEKTE' )
			showLayer( 'lyr1' )
			showLayer( 'scrollLinks' )
			hideLayer( 'KONTAKT' )
			hideLayer( 'INHALT02' )
			hideLayer( 'INHALT03' )
			hideLayer( 'INHALT05' )
			hideLayer( 'INHALT06' )
			hideLayer( 'INHALT07' )
		}
		else
			hideLayer( layer_id )
	}
		function showKontakt( layer_id ) {
		if( getVisibility( layer_id ) == false ) {
			showLayer( 'KONTAKT' )
			hideLayer( 'INHALT02' )
			hideLayer( 'INHALT03' )
			hideLayer( 'INHALT05' )
			hideLayer( 'INHALT06' )
			hideLayer( 'INHALT07' )
			hideLayer( 'lyr1' )
			hideLayer( 'wn' )
			hideLayer( 'scrollLinks' )
		}
		else
			hideLayer( layer_id )
	}
	function showInhalt02( layer_id ) {
		if( getVisibility( layer_id ) == false ) {
			showLayer( 'INHALT02' )
			hideLayer( 'INHALT03' )
			hideLayer( 'INHALT05' )
			hideLayer( 'INHALT06' )
			hideLayer( 'INHALT07' )
			hideLayer( 'KONTAKT' )
			hideLayer( 'lyr1' )
			hideLayer( 'wn' )
			hideLayer( 'scrollLinks' )
		}
		else
			hideLayer( layer_id )
	}
	function showInhalt03( layer_id ) {
		if( getVisibility( layer_id ) == false ) {
			showLayer( 'INHALT03' )
			hideLayer( 'INHALT02' )
			hideLayer( 'INHALT05' )
			hideLayer( 'INHALT06' )
			hideLayer( 'INHALT07' )
			hideLayer( 'KONTAKT' )
			hideLayer( 'lyr1' )
			hideLayer( 'wn' )
			hideLayer( 'scrollLinks' )
		}
		else
			hideLayer( layer_id )
	}
	function showInhalt05( layer_id ) {
		if( getVisibility( layer_id ) == false ) {
			showLayer( 'INHALT05' )
			hideLayer( 'INHALT02' )
			hideLayer( 'INHALT03' )
			hideLayer( 'INHALT06' )
			hideLayer( 'INHALT07' )
			hideLayer( 'KONTAKT' )
			hideLayer( 'lyr1' )
			hideLayer( 'wn' )
			hideLayer( 'scrollLinks' )
		}
		else
			hideLayer( layer_id )
	}
	function showInhalt06( layer_id ) {
		if( getVisibility( layer_id ) == false ) {
			showLayer( 'INHALT06' )
			hideLayer( 'INHALT02' )
			hideLayer( 'INHALT03' )
			hideLayer( 'INHALT05' )
			hideLayer( 'INHALT07' )
			hideLayer( 'KONTAKT' )
			hideLayer( 'lyr1' )
			hideLayer( 'wn' )
			hideLayer( 'scrollLinks' )
		}
		else
			hideLayer( layer_id )
	}
	function showInhalt07( layer_id ) {
		if( getVisibility( layer_id ) == false ) {
			showLayer( 'INHALT07' )
			hideLayer( 'INHALT02' )
			hideLayer( 'INHALT03' )
			hideLayer( 'INHALT05' )
			hideLayer( 'INHALT06' )
			hideLayer( 'KONTAKT' )
			hideLayer( 'lyr1' )
			hideLayer( 'wn' )
			hideLayer( 'scrollLinks' )
		}
		else
			hideLayer( layer_id )
	}