jQuery init function (partial)

gistfile1.js

init: function( selector, context, rootjQuery ) {
    var match, elem, ret, doc;
		
    // Handle $(""), $(null), or $(undefined)
    if ( !selector ) {
        return this;
    }
		
    // Handle $(DOMElement)
    if ( selector.nodeType ) {
        this.context = this[0] = selector;
        this.length = 1;
        return this;
    }