var myVisible = '1';

myArray= new Array();
myArray[0]= "left1";
myArray[1]= "left1_sub2";
myArray[2]= "left1_sub6";
myArray[3]= "left1_sub3";
myArray[4]= "left1_sub4";
myArray[5]= "left1_sub5";
myArray[6]= "left1_sub7";
myArray[7]= "left2";
myArray[8]= "left2_sub1";
myArray[9]= "left2_sub3";
myArray[10]= "left2_sub6";
myArray[11]= "left2_sub5";
myArray[12]= "left2_sub4";
myArray[13]= "left2_sub7";
myArray[14]= "left3";
myArray[15]= "left3_sub1";
myArray[16]= "left3_sub2";
myArray[17]= "left3_sub3";
myArray[18]= "left3_sub4";
myArray[19]= "left3_sub5";
myArray[20]= "left3_sub7";
myArray[21]= "left4";
myArray[22]= "left4_sub8";
myArray[23]= "left4_sub2";
myArray[24]= "left4_sub3";
myArray[25]= "left4_sub4";
myArray[26]= "left4_sub5";
myArray[27]= "left4_sub7";
myArray[28]= "left3_sub6";
myArray[29]= "left4_sub6";
myArray[30]= "left5";
myArray[31]= "left5_sub1";
myArray[32]= "left5_sub2";
myArray[33]= "left6";

var myActief = '';

function actief(a) {
	for (var i=0; i<myArray.length; i++) {
		document[myArray[i]].src='images/bt_'+myArray[i]+'.gif';
	}
	if (a != '') {
		document[a].src='images/bt_'+a+'_on.gif';
	}
	myActief = a;
}

function muisover(a) {
	document[a].src='images/bt_'+a+'_on.gif';
}

function muisuit(a) {
	if (myActief != a){
		document[a].src='images/bt_'+a+'.gif';
	}
}

function uitklap(a) {
	if (document.getElementById) {
		if (document.getElementById('sub'+a).style.visibility == 'visible') {
			myVisible = '0';
		}
		for (i=1; i<=5; i++) {
			document.getElementById('sub'+i).style.visibility = 'hidden';
			document.getElementById('sub'+i).style.display = 'none';
		}
		if (myVisible != '0') {
			document.getElementById('sub'+a).style.visibility = 'visible';
			document.getElementById('sub'+a).style.display = 'inline';
		}
		myVisible = '1';
	} else if (document.all) {
		if (document.all['sub'+a].style.visibility == 'visible') {
			myVisible = '0';
		}
		for (i=1; i<=5; i++) {
			document.all['sub'+i].style.visibility = 'hidden';
			document.all['sub'+i].style.display = 'none';
		}
		if (myVisible != '0') {
			document.all['sub'+a].style.visibility = 'visible';
			document.all['sub'+a].style.display = 'inline';
		}
		myVisible = '1';
	} else if (document.layers) {
		if (document.layers['sub'+a].style.visibility == 'visible') {
			myVisible = '0';
		}
		for (i=1; i<=5; i++) {
			document.layers['sub'+i].style.visibility = 'hidden';
			document.layers['sub'+i].style.display = 'none';
		}
		if (myVisible != '0') {
			document.layers['sub'+a].style.visibility = 'visible';
			document.layers['sub'+a].style.display = 'inline';
		}
		myVisible = '1';
	}
}