var timeoutID;
function HideAll(){if(document.getElementById){document.getElementById("eventsDropDown").style.visibility='hidden';document.getElementById("groupsDropDown").style.visibility='hidden'; document.getElementById("videoDropDown").style.visibility='hidden'; document.getElementById("aboutDropDown").style.visibility='hidden'; } else if(document.layers){document.layers.eventsDropDown.visibility='hidden'; document.layers.groupsDropDown.visibility='hidden'; document.layers.videoDropDown.visibility='hidden'; document.layers.aboutDropDown.visibility='hidden'; } else if(document.all){document.all.eventsDropDown.style.visibility='hidden'; document.all.groupsDropDown.style.visibility='hidden'; document.all.videoDropDown.style.visibility='hidden'; document.all.aboutDropDown.style.visibility='hidden'; } return true;} 
function Show(elementID){if(document.getElementById&&elementID!='none'){document.getElementById(elementID).style.visibility='visible'; } else if(document.layers&&document.layers[elementID]){document.layers[elementID].visibility='visible'; } else if(document.all&&elementID!='none'){document.all[elementID].style.visibility='visible'; } return true;} 
function ShowAndHide(elementID){window.clearTimeout(timeoutID); HideAll(); Show(elementID); if(elementID!='none'){timeoutID=window.setTimeout("HideAll()", 3000); } return true;}