function toggle(thebut,layerid,layercount) {
	var theimg1=document.getElementById(thebut.id+'img1');

	var thetree=document.getElementById(thebut+layerid+'tree');
	if (thetree.style.display=='none') {
		openbutton(thebut,theimg1,layerid,layercount);
	} else {
		closebutton(thebut,theimg1,layerid);
	}
}

function openbutton(thebut,theimg1,layerid,layercount) {
	var thetree=document.getElementById(thebut+layerid+'tree');
	thetree.style.display='';
	//theimg1.src='images/minus.gif';

	for(i=0;i<layercount;i++) {
		if (i!=layerid) {
			var thetree=document.getElementById(thebut+i+'tree');
			thetree.style.display='none';
			//var theimg1=document.getElementById(thebut+i+'img1');
			//theimg1.src='images/plus.gif';
 		}
	}
}

function closebutton(thebut,theimg1,layerid) {
	var thetree= document.getElementById(thebut+layerid+'tree');
	thetree.style.display='none';
	//theimg1.src='images/plus.gif';
}