function resizeMenu(){
	var h = parseInt(document.getElementById('col_cen').offsetHeight);
	var hm = parseInt(document.getElementById('col_izq').offsetHeight);
	var fh;
	if( h > hm ){
		var fh = h;
		document.getElementById('col_izq').style.height = h;		
	}
	else fh = hm;
	document.getElementById('blq_cen_der_2').style.height = fh - 30;
}

function showLayer(n){
	var el = document.getElementById(n);
	if(el){
		if(el.style.display == 'none') el.style.display = 'block';
		else el.style.display = 'none';
	}
}

function selModel(b, model){
	document.formPhones['params.model'].length = 1;		
	if(!b){
		document.formPhones['params.brand'].options[0].text = 'Marca';		
		if( document.formPhones['params.brand'].value ) b = document.formPhones['params.brand'].value
		else document.formPhones['params.brand'].options[0].value = '';
	}
	var len = !b ? [] : typePhone[b].length;
	for(var i = 0; i < len; i++){
	   	document.formPhones['params.model'].length++;		
       	document.formPhones['params.model'].options[document.formPhones['params.model'].length - 1].text = typePhone[b][i];
      	document.formPhones['params.model'].options[document.formPhones['params.model'].length - 1].value = typePhone[b][i];
	}	
	if (typeof(model) != 'undefined') {
        for(var i = 0; i < document.formPhones['params.model'].length; i++){ 
	        if (document.formPhones['params.model'].options[i].value == model)
	            document.formPhones['params.model'].options[i].selected = true;
	    }
	}
}

function checkForm(o){
	for( var i = 0; i < o.children.length; i++ ){
		if( o.children[i].name ){
			if( !o.children[i].value ){
				alert( "Debe rellenar todos los campos." ); 
				return false;
			}
		}
	}
	return true;
}