function initsearch()
{
	if(document.getElementById('txtbusqueda').value.length>3){
		document.location='/public/busqueda.aspx?str='+document.getElementById('txtbusqueda').value+'&sec='+document.getElementById('seccion').value;}
	else{
		alert('Ha de introducir al menos 4 caracteres para iniciar la busqueda.');}
}
function checkEnter(e){ //e is event object passed from function invocation
	var characterCode; // literal character code will be stored in this variable

	if(e && e.which){ //if which property of event object is supported (NN4)
		e = e;
		characterCode = e.which; //character code is contained in NN4's which property
	}
	else{
		e = event;
		characterCode = e.keyCode; //character code is contained in IE's keyCode property
	}

	if(characterCode == 13){ //if generated character code is equal to ascii 13 (if enter key)
		//document.forms[0].submit(); //submit the form
		initsearch();
		//return false 
	}
	else{
		return true;
	}

}