[Google Maps API v2] id for marker

hi
here http://suprofitweb.ru/google/map.php i have code\map
how can i call marker for hide it?
for example: markers: [{
lat: 42.339641,
lng: -71.094224,
id:'mark', //
name:'mark', //
marker: {title: 'Boston Museum of Fine
Arts',draggable:true},
listeners: {
click: function(e){
Ext.Msg.alert('point_lat', e.x+', '+e.y);
mark.hide=true; //
}
OR mark.hide='true;' - it doesnt work

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