function showDropdownBn() {
	if(document.getElementById('myDropdownBnBig')) {
		var myBn = document.getElementById('myDropdownBnBig');
		if (myBn.style.visibility != 'visible')  {
			myBn.style.visibility = 'visible';
			myBn.style.left = 0;
			myBn.style.top = 0;
			document.getElementById('myDropdownBnSmall').style.visibility = 'hidden';
		}
	}
}
function hideDropdownBn() {
	if(document.getElementById('myDropdownBnBig')) {
		var myBn = document.getElementById('myDropdownBnBig');
		if (myBn.style.visibility == 'visible' || myBn.style.visibility != 'hidden')  {
			myBn.style.visibility = 'hidden';
			myBn.style.left = '-5000px';
			myBn.style.top = '-5000px';
			document.getElementById('myDropdownBnSmall').style.visibility = 'visible';
		}
	}
}

function hideDropDownBnWithDelay() {
	setTimeout('hideDropdownBn()', 1000);
}