function toggleSubMenu(strId)
{
	if(document.getElementById('subCat' + strId).style.visibility != 'visible')
	{
		document.getElementById('subCat' + strId).style.visibility = 'visible';
		document.getElementById('subCat' + strId).style.display = 'block';
		document.getElementById('img'+strId).src = '../images/minus.gif';
	}
	else
	{
		document.getElementById('subCat' + strId).style.visibility = 'hidden';
		document.getElementById('subCat' + strId).style.display = 'none';
		document.getElementById('img' + strId).src = '../images/plus.gif';
	}
}