function toggleElementVisibility(ElementName, ElementVisibility) { 
	if(ElementVisibility == 1)
		ElementVisibility = '';
	else
		ElementVisibility = 'none';

	if (document.getElementById)
		document.getElementById(ElementName).style.display = ElementVisibility;
	else if (document.all)
		document.all[ElementName].style.display = ElementVisibility;
}

function HideAlert() { toggleElementVisibility('AlertMessage', 0); }