function FirstChild(sName) {
	this.child = null;
	var oContentNode = document.getElementById(sName);
	for (i=0; i<oContentNode.childNodes.length; i++) {
		if (oContentNode.childNodes[i].nodeType==1) {
			this.child = oContentNode.childNodes[i];
			break;
		}
	}
}
function getNumber(sSting) {
	var oRegEx = new RegExp('[A-Za-z]', 'g');
	var sTemp = sSting.replace(oRegEx,'');
	return (sTemp.length>0) ? parseInt(sTemp) : null ;
}