in rico.js [859:871]
_whichSideTop: function() {
if ( this._hasString(this.options.corners, "all", "top") )
return "";
if ( this.options.corners.indexOf("tl") >= 0 && this.options.corners.indexOf("tr") >= 0 )
return "";
if (this.options.corners.indexOf("tl") >= 0)
return "left";
else if (this.options.corners.indexOf("tr") >= 0)
return "right";
return "";
},