var registro;

function abrir_ventana(url,nombre,tam_x,tam_y) {
    if (document.all) {var xMax = screen.width, yMax = screen.height;
    var xOffset = (xMax - tam_x)/2, yOffset = (yMax - tam_y)/2;}
    else
    if (document.layers) {var xMax = window.outerWidth, yMax = window.outerHeight;
    var xOffset = (xMax - tam_x)/2, yOffset = (yMax - tam_y)/2;}
	if(registro==null){
    registro=window.open(url,nombre,'width='+ tam_x +',height='+ tam_y +',screenX='+xOffset+',screenY='+yOffset+',  top='+yOffset+',left='+xOffset+', scrollbars=yes');
    }else{
	registro=window.open(url,nombre,'width='+ tam_x +',height='+ tam_y +',screenX='+xOffset+',screenY='+yOffset+',  top='+yOffset+',left='+xOffset+', scrollbars=yes');
	registro.focus();
	}
}

function cant(opt,provincias,j){
	this.location.href='carrito.asp?cant='+provincias+'&nombre='+opt+'&producto='+j;
}

function borrar(){
	document.form1.action='borrar.asp';
	document.form1.submit();
}
function enviar(){
	document.form1.action='comprobar.asp';
	document.form1.submit();
}