function ventana(form,direccion,largo,ancho) {    
	var address = direccion;   
	var op_tool  = "0";
	var op_loc_box  = "0";
	var op_dir  = "0";
	var op_stat  = "0";
	var op_menu  = "0";
	var op_scroll  = "0";
	var op_resize  = "0"
	var op_wid  = largo;   
	var op_heigh = ancho;                 
	var option = "toolbar="      + op_tool +                ",location="    + op_loc_box +                ",directories=" 
	+ op_dir +                ",status="      + op_stat 
	+                ",menubar="     + op_menu +                ",scrollbars="  
	+ op_scroll +                ",resizeable="  + op_resize 
	+                ",width="       
	+ op_wid +                ",height="      + op_heigh;
	var win3 = window.open("", "lo_que_yo_quiero", option);  
	var win4 = window.open(address, "lo_que_yo_quiero");
}