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Position: Allow without "at" option passed. (Not need it when align to cursor.)
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@ -51,7 +51,7 @@ $.fn.position = function(options) {
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// force my and at to have valid horizontal and veritcal positions
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// if a value is missing or invalid, it will be converted to center
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$.each(['my', 'at'], function() {
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var pos = options[this].split(' ');
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var pos = ( options[this] || horizontalDefault ).split(' ');
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pos = pos.length == 1
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? horizontalPositions.test(pos[0])
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? pos.concat([verticalDefault])
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