function AbrirCentro(url,nompopup,popW,popH,scroll,resizable){
	w = screen.availWidth;
	h = screen.availHeight;
	var leftPos = (w-popW)/2, topPos = (h-popH)/2;
	window.open(url,nompopup,'width=' + popW + ',height=' + popH + ',top=' + topPos + ',left=' + leftPos + ',resizable=' + resizable + ',scrollbars=' + scroll );
}

function registro_bandas()
{
	var url = 'bandas_registro.asp';
	AbrirCentro(url,'rb','490','410','yes','no')
}