function treeOpacityDefault() {
	abc=document.getElementById("tree");
	abc.style.opacity = .3;
	abc.style.filter = 'alpha(opacity=30)';
}

function treeOpacityOver() {
	testObj=document.getElementById("tree");
	testObj.style.opacity = 1;
	testObj.style.filter = 'alpha(opacity=100)';
}