var xmlHttp;

function showPage(str){
	xmlHttp=GetXmlHttpObject();
	var url;
	if (str.length==0){ 
		url = "home.php"
		xmlHttp.onreadystatechange=stateChanged;
		xmlHttp.open("GET",url,true);
		xmlHttp.send(null);
  		document.getElementById("txtContent").innerHTML="";
  		return;
  	}

	if (xmlHttp==null){
  		alert ("Your browser does not support AJAX!");
  		return;
  	} 
	url=str;
	//url=url+"&sid="+Math.random();
	xmlHttp.onreadystatechange=stateChanged;
	xmlHttp.open("GET",url,true);
	xmlHttp.send(null);
} 

function sendEmail(str){
	xmlHttp=GetXmlHttpObject();
	var url="email.php";
	if (str.length==0){
		return;
	}
	if (xmlHttp==null){
  		alert ("Your browser does not support AJAX!");
  		return;
  	} 
	xmlHttp.onreadystatechange=stateChanged;
//	xmlhttp.setRequestHeader("Content-Type", "application/x-www-form-urlencoded");
	xmlHttp.open("GET",url,true);
	xmlHttp.send("email=" + document.getElementById(txtEmail));
}

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

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;
}