//CONJUNTO DE FUNCIONES QUE PERMITEN AL SISTEMA INTERACTUAR EN AJAX

function clearText(id){
		document.getElementById(id).value="";
		document.getElementById(id).style.color="#000000";
	}
function cambiaCelda(id){
		document.getElementById(id).style.backgroundColor="#000000";
		document.getElementById(id).style.color="#FFFFFF";					
	}

function muestraTexto(id){
	xmlHttp = GetXmlHttpObject();
	if(xmlHttp == null){
		alert("Tu navegador no soporta AJAX");
		return;	
	}
	var url = "../controllers/indexContenido.php?item="+id;
	xmlHttp.onreadystatechange = stateChanged;
	xmlHttp.open("GET", url, true);
	xmlHttp.send(null);
}
function stateChanged(){
	if((xmlHttp.readyState == 4)){
			document.getElementById("centerPane").innerHTML = xmlHttp.responseText;	
	}	
}
function GetXmlHttpObject(){
	var xmlHttp = null;
	try{
		xmlHttp = new XMLHttpRequest();	
	}catch(e){
				try{
					xmlHttp = new ActiveXObject("Msxml2.XMLHTTP");
				}catch(e){
						xmlHttp = new ActiveXObject("Microsoft.XMLHTTP");	
					}
	}
		return xmlHttp;
}
	
function checaSubmit(uno,dos){
		if(uno != null){
			if(document.getElementById(uno).value == ""){
				return false;
			}if(dos != null){
				if(document.getElementById(dos).value == ""){
					return false;
				}
			}
		}else{
			if(document.getElementById("matricula").value == ""){
				return false;						
			}
		}
		return true;
	}
	
function ajustar()
{
var divHeight = document.getElementById("areaContenido").offsetHeight;
document.getElementById('leftPane').style.height = divHeight-150+'px';

}