function tabChange(n) {
	var conID = new Array ("class_0","class_1","class_2","class_3","class_4","class_5","class_6","class_7","class_8","class_9","class_10","class_11","class_12","class_13","class_14","class_15","class_16","class_17","class_18","class_19","class_20","class_21","class_22","class_23","class_24","class_25","class_26","class_27")
	var objID = new Array ("class1_00","class1_11","class1_22","class1_33","class1_44","class1_55","class1_66","class1_77","class1_88","class1_99","class1_1010","class1_1111","class1_1212","class1_1313","class1_1414","class1_1515","class1_1616","class1_1717","class1_1818","class1_1919","class1_2020","class1_2121","class1_2222","class1_2323","class1_2424","class1_2525","class1_2626","class1_2727")
	for (var i=0;i < conID.length;i++) {
		if (n==i) {
			var currentObj=getObject(conID[i]);
			var targetOobj=getObject(objID[i]);
			currentObj.className=currentObj.className==="off"?"on":"off";
			targetOobj.className=targetOobj.className==="on"?"off":"on";
	 }
	}
}