window.onload = function(){
	var inputs = document.getElementById("formulario").elements;
	
	for(i=1; i<inputs.length; i++){
		//alert(inputs[i].name);
		id = "liquido"+i+"";
		//alert(id);
		//why this does not work
		if(inputs[i].name == id){
			alert(id);
		}

		//what's the different with this way
		if(inputs[i].name == "liquido1"){
			alert(id);
		}
	}
}