var xmlHttpc;

function showaddPeriods(sta, stb, stc, std)
{ 
xmlHttpc=GetXmlHttpObjectc();
if (xmlHttpc==null)
 {
 alert ("Browser does not support HTTP Request");
 return;
 }
var url="default.php?page=period_function";

url=url+"&periodfunction=add";

url=url+"&period_join="+sta;

url=url+"&period_leave="+stb;
url=url+"&period_voice="+stc;
url=url+"&period_position="+std;

url=url+"&sid="+Math.random();
xmlHttpc.onreadystatechange=stateChangedc;
xmlHttpc.open("GET",url,true);
xmlHttpc.send(null);
}


function showdeletePeriods(str)
{ 
xmlHttpc=GetXmlHttpObjectc();
if (xmlHttpc==null)
 {
 alert ("Browser does not support HTTP Request");
 return;
 }
var url="default.php?page=period_function";

url=url+"&periodfunction=delete";

url=url+"&period_join="+str;
url=url+"&sid="+Math.random();
xmlHttpc.onreadystatechange=stateChangedc;
xmlHttpc.open("GET",url,true);
xmlHttpc.send(null);
}



function stateChangedc() 
{ 
if (xmlHttpc.readyState==4 || xmlHttpc.readyState=="complete")
 { 
 document.getElementById("txtPeriods").innerHTML=xmlHttpc.responseText;
 } 
}

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