function dropDown(oID){
			 	
new Effect.Parallel(
		[
			new Effect.SlideDown($(oID),{sync:true}),
			new Effect.Appear($(oID),{sync:true})
		],
		{
			duration:0.5,
			fps:40
		}
	);
}

function dropUp(oID){
	new Effect.Parallel(
		[
			new Effect.SlideUp($(oID),{sync:true}),
			new Effect.Fade($(oID),{sync:true})
		],
		{
			duration:0.5,
			fps:40
		}
	);
}


function changeSession(sStr, bVal) {
	var xmlHttpReq = false;
    var self = this;
    
    // Mozilla/Safari
    if (window.XMLHttpRequest) {
        self.xmlHttpReq = new XMLHttpRequest();
    }
    // IE
    else if (window.ActiveXObject) {
        self.xmlHttpReq = new ActiveXObject("Microsoft.XMLHTTP");
    }

    self.xmlHttpReq.open('GET', 'changeSession.php?s='+sStr+'&val='+bVal, true);
    self.xmlHttpReq.setRequestHeader('Content-Type', 'text/xml');

    self.xmlHttpReq.send(null);
}