// ======== dropdown menu functions ===============================
function showDropDown(thisNav) {
	document.getElementById(thisNav).style.display = "block";
}
function hideDropDown(thisNav) {
	document.getElementById(thisNav).style.display = "none";
}
function hideDropDownAll() {
	document.getElementById("subnav1").style.display = "none";
	document.getElementById("subnav2").style.display = "none";
	document.getElementById("subnav3").style.display = "none";
}