function GetXmlHttpObject() {
	var xmlHttp=null;
  	try {
  		// Firefox, Opera 8.0+, Safari
    	xmlHttp=new XMLHttpRequest();
    } catch (e) {
    	// Internet Explorer
    	try  {
      		xmlHttp=new ActiveXObject("Msxml2.XMLHTTP");
      	} catch (e) {
      		xmlHttp=new ActiveXObject("Microsoft.XMLHTTP");
      	}
    }
  	return xmlHttp;
}


function stateChanged() { 
	if (xmlHttp.readyState==4) { 
		document.getElementById("sp_dashboard").innerHTML=xmlHttp.responseText;
	}
}



function showEvent(str) {

	xmlHttp=GetXmlHttpObject()
	if (xmlHttp==null) {
  		alert ("Your browser does not support AJAX!");
  		return;
  	} 

	var url="seattle_presents_header.asp?" + "&sid="+Math.random();
	
	if (str == -1){
		url = url + "&eventNav=down"
	} else if (str == 1) {
		url = url + "&eventNav=up"
	}
	
	
	xmlHttp.onreadystatechange=stateChanged;
	xmlHttp.open("GET",url,true);
	xmlHttp.send(null);
}