var myVar = "I'm the global";
function masker(myVar){
myVar; // ?// "I'm the argument" -- outer variable gets masked
}
masker("I'm the argument");
myVar; // ?// "I'm the global" -- outer variable remains unchanged
// look at usage for jQuery Plugins:
// http://learn.jquery.com/plugins/basic-plugin-creation/#protecting-the-alias-and-adding-scope