function checkPromo(){
	if(document.getElementById('Register')){
		var externalimage=document.getElementById('Register');
		externalimage.src="http://salesforce.vo.llnwd.net/o1/emea/dreamforceeurope09/cta-reg-small.gif";
	}
}

function toggle(id){
	var row = document.getElementById(id);
	if (row.style.display=='none'){
		row.style.display='block';
	}else{
    		row.style.display='none';
	}
}

var currentPos=0;
var numberOfSpeakers=3;
var speakerWidth=460;

function moveSpeakers(which)
{
	currentPos=-speakerWidth*which;
	$('speakers-container').morph("margin-left:"+currentPos+"px;");
}