function bildwechsel ( zielId, SRC) {
	bild = document.getElementById(zielId);
  	bild.src = SRC;
}

function toggleOverview( Id, ArrowId ) {
/*  	Effect.toggle(Id,'slide',{duration:2.0});
*/

/* should be IE6-safer */

	toggleDisplay( Id );
	switchArrow( ArrowId );
 
}

function switchArrow( ArrowId ) {
 	
	var arrow = document.getElementById( ArrowId );
  	
	if ( arrow.src == 'xtension/arrow-down.png' ) {
  		document.getElementById( ArrowId ).src = 'xtension/arrow-up.png';
	} else {
		document.getElementById( ArrowId ).src = 'xtension/arrow-down.png';
  	}
}

function toggleDisplay( Id ) {
	var d = document.getElementById(Id).style.display;
	if ( d == 'none' ) {
  		document.getElementById(Id).style.display = 'block';
	} else {
		document.getElementById(Id).style.display = 'none';
  	}
}


function toggleVisibility( Id ) {
  	if ( document.getElementById(Id).style.visibility=='collapse') {
  		document.getElementById(Id).style.visibility='visible'
		/* arrow.src = 'xtension/arrow-up.png'; */
	} else {
		document.getElementById(Id).style.visibility='collapse'
		/* arrow.src = 'xtension/arrow-down.png'; */
  	}
}