function initEventCache( el, evt ) {
		if ( !el.shoestringData ) {
			el.shoestringData = {};
		}
		if ( !el.shoestringData.events ) {
			el.shoestringData.events = {};
		}
		if ( !el.shoestringData.loop ) {
			el.shoestringData.loop = {};
		}
		if ( !el.shoestringData.events[ evt ] ) {
			el.shoestringData.events[ evt ] = [];
		}
	}
Wraps the child elements in the provided HTML.

@param {string} html The wrapping HTML.
@return shoestring
@this shoestring