function ValorDesplegarQueryString() {
	var query = window.location.search.substring(1);
	var parms = query.split('&');
	for (var i=0; i<parms.length; i++) {
		var pos = parms[i].indexOf('=');
		if (pos > 0) {
			var key = parms[i].substring(0,pos);
			var val = parms[i].substring(pos+1);
			if (key == 'desplegado')
			{
				return (val)
			}		
		}
	}
}

function setClassName(objId, className) {
    	document.getElementById(objId).className = className;
}
	
function Transiciones(){
	if (ValorDesplegarQueryString() == 'no') 
	{	
		t1 = new Tween(document.getElementById('contenidos').style,'bottom',Tween.strongEaseOut,-274,-2,1,'px'); 
		t1.start();
		opacity('imagenes', 0,100,1000);
	}
	else
	{
		document.getElementById('contenidos').style.bottom = "-2px";
		opacity('imagenes', 0,100,1000);
	}
}