function doSection(secNum){ 
	if (secNum.className=="off"){secNum.className="on"}  else{secNum.className="off"}
}
function doSectionTree(secNum1,secNum2,secNum3){ 
	if (secNum1.className=="off"){secNum1.className="on";secNum2.className="on";secNum3.className="off";}  else{secNum1.className="off";secNum2.className="off";secNum3.className="on";}
}