function fnAddHTML (oBlockSection, sBlockedLayerId) {
		var oContainer = document.createElement("div");
		oContainer.id = sBlockedLayerId;
		oContainer.className = "sapUiBlockLayer ";

		// Make the blockLayer tabbable
		oContainer.setAttribute("tabindex", "0");

		oBlockSection.appendChild(oContainer);

		return oContainer;
	}
Adds the BlockLayer to the given DOM.

@param {object} oBlockSection The DOM to be appended. This can be a DOM section or the DomRef of a control.
@param {string} sBlockedLayerId The controls id
@returns {object} oContainer The block layer DOM

@private