var curr_dropdown = null;

function startdropdown(dropdiv) {
	if ((curr_dropdown != dropdiv) && (curr_dropdown != null && curr_dropdown != '')) {
		var hidediv = document.getElementById(curr_dropdown);
		hidediv.style.display = 'none';
	}
	curr_dropdown = dropdiv;
	var thediv = document.getElementById(dropdiv);
	thediv.style.display = 'block';
	// setTimeout('',300);
}

function checkdropdown(dropdiv) {
	var thediv = document.getElementById(dropdiv);
	if (curr_dropdown == '') {
		thediv.style.display = 'none';
	}
}

function cleardropdown() {
	if (curr_dropdown != null && curr_dropdown != '') {
		var hidediv = document.getElementById(curr_dropdown);
		hidediv.style.display = 'none';
	}
	curr_dropdown = '';
}