function getXMLHTTPRequestCentSin() {
try {
reqCentSin = new XMLHttpRequest();
} catch(err1) {
  try {
  reqCentSin = new ActiveXObject("Msxml2.XMLHTTP");
  } catch (err2) {
    try {
    reqCentSin = new ActiveXObject("Microsoft.XMLHTTP");
    } catch (err3) {
      reqCentSin = false;
    }
  }
}
return reqCentSin;
}


var httpCentSin = getXMLHTTPRequestCentSin();

function useHttpResponseCentSin() {
   if (httpCentSin.readyState == 4) {
    if(httpCentSin.status == 200) {
      var img = httpCentSin.responseText;
      document.getElementById('actualizacionC').innerHTML = img;
    }
  }
}

function principal(a)
{
    var myurl = 'principalC.html';
  	myRand = parseInt(Math.random()*999999999999999);
  	var modurl = myurl+"?rand="+myRand;
  	httpCentSin.open("GET", modurl, true);
  	httpCentSin.onreadystatechange = useHttpResponseCentSin;
  	httpCentSin.send(null);
}

function botonesIzq(a)
{
     switch(a)
  {
	case 0: var myurl = 'IsoC.html';
	break;	  
	case 1: var myurl = 'HistoriaC.html';
	break;
	case 2: var myurl = 'EventosC.html';
	break;	
	case 3: var myurl = 'ReglamentoC.html';
	break;		
	case 4: var myurl = 'CostosC.html';
	break;		
	case 5: var myurl = 'BecasC.html';
	break;	
	case 6: var myurl = 'GaleriaC.html';
	break;	
	case 7: var myurl = 'LecturaC.html';
	break;	
	case 8: var myurl = 'pianoC.html';
	break;
	
  }  
  	myRand = parseInt(Math.random()*999999999999999);
  	var modurl = myurl+"?rand="+myRand;
  	httpCentSin.open("GET", modurl, true);
  	httpCentSin.onreadystatechange = useHttpResponseCentSin;
  	httpCentSin.send(null);
}

function costosAct(a)
{
     switch(a)
  {
	case 0: var myurl = 'CostosC.html';
	break;	
	case 1: var myurl = 'CostosCuautla.html';
	break;	
	case 2: var myurl = 'InscripcionesC.html';
	break;	
	case 3: var myurl = 'UNIFORMES.html';
	break;	
  }  
  	myRand = parseInt(Math.random()*999999999999999);
  	var modurl = myurl+"?rand="+myRand;
  	httpCentSin.open("GET", modurl, true);
  	httpCentSin.onreadystatechange = useHttpResponseCentSin;
  	httpCentSin.send(null);
}

function botonesSup(a)
{
     switch(a)
  {
	case 0: var myurl = 'principalC.html';
	break;
	case 1: var myurl = 'PreescolarC.html';
	break;
	case 2: var myurl = 'PrimariaC.html';
	break;
	case 3: var myurl = 'SecundariaC.html';
	break;
	case 4: var myurl = 'PreparatoriaC.html';
	break;
	case 5: var myurl = 'FundacionC.html';
	break;
  }  
  	myRand = parseInt(Math.random()*999999999999999);
  	var modurl = myurl+"?rand="+myRand;
  	httpCentSin.open("GET", modurl, true);
  	httpCentSin.onreadystatechange = useHttpResponseCentSin;
  	httpCentSin.send(null);
}

function botonesInf(a)
{
     switch(a)
  {
	case 1: var myurl = 'InstalacionesC.html';
	break;
	case 2: var myurl = 'GruposC.html';
	break;
	case 3: var myurl = 'CronogramaC.html';
	break;
	case 4: var myurl = 'CodigoC.html';
	break;
	case 5: var myurl = 'GaleriaC.html';
	break;
  }  
  	myRand = parseInt(Math.random()*999999999999999);
  	var modurl = myurl+"?rand="+myRand;
  	httpCentSin.open("GET", modurl, true);
  	httpCentSin.onreadystatechange = useHttpResponseCentSin;
  	httpCentSin.send(null);
}

function fundacion(a)
{
     switch(a)
  {
	case 1: var myurl = 'Expo1.html';
	break;
	case 2: var myurl = 'Expo2.html';
	break;	
	case 3: var myurl = 'Expo3.html';
	break;		
	case 4: var myurl = 'Expo4.html';
	break;		
	case 5: var myurl = 'Expo5.html';
	break;	
	case 6: var myurl = 'Expo6.html';
	break;	
	case 7: var myurl = 'Expo7.html';
	break;	
	case 8: var myurl = 'Expo8.html';
	break;
	case 9: var myurl = 'Expo9.html';
	break;
	case 10: var myurl = 'Expo10.html';
	break;
	case 11: var myurl = 'Expo11.html';
	break;
  }  
  	myRand = parseInt(Math.random()*999999999999999);
  	var modurl = myurl+"?rand="+myRand;
  	httpCentSin.open("GET", modurl, true);
  	httpCentSin.onreadystatechange = useHttpResponseCentSin;
  	httpCentSin.send(null);
}