$(document).ready(function() { $.markerPen(); });
You have three options to specify while initializing the plugin. You can change the color, stroke width and the transparency of the markings. If you don't specify them then the default color is yellow, stroke width is 10 and the opacity is 0.7 .
$(document).ready(function() { $.markerPen({ "color":"red", "stroke":20, "opacity":".5" }); });