function validalogin(form) {
	if(form.elements[0].value == '' || form.elements[1].value == '') {
	alert("Introduzca ambos datos por favor.");
		   if(form.elements[0].value == ''){
		   form.elements[0].focus();   
		   }else{
		   form.elements[1].focus();   
		   }
	return false;
	}else{
	return true;	
	}
}

function setfoco(){
	document.flogin.elements[0].focus(); 	
}

function enableupload(form){
	if(form.elements[28].checked){
		form.elements[29].disabled=false;
		}	
}

function disableupload(form){
	form.elements[29].disabled=true;
}
	
function disable1(form){
	//array con las posiciones de elementos a deshabilitar
	var lista = new Array(1,3,5,7,9,10,11,12,13,14,16,18,19,21,23,25,27,28,29,30,31,33,35,37,38,40,42,43,45,47,49,51,53);
	var i;
	var j;
	for(i=0;i<form.elements.length;i++){
		for(j=0;j<lista.length;j++){
			if(i == lista[j]){
				form.elements[i].disabled=true;
			}
		}	
	}
}

function enablesearch(form,var1,var2){
	//lo habilito solo si esta checked
	if(form.elements[var1].checked){
		form.elements[var2].disabled=false;
		}else{
		form.elements[var2].disabled=true;
		}
}

function disabelem(form,elem){
	form.elements[elem].disabled=true;
	}
function enabelem(form,elem){
	form.elements[elem].disabled=false;
	}