function HideColumn(clmn){
	// hide left column
	if (clmn=='1') {
	document.getElementById("Middle").id="MiddleFull";
	document.getElementById("Left").style.display="none";
	}

	// hide both columns make middle full
	if (clmn=='2') {
	document.getElementById("Middle").id="MiddleFullBoth";
	document.getElementById("Right").style.display="none";
	document.getElementById("Left").style.display="none";	
	}

	// hide right column
	if (clmn=='3') {
	document.getElementById("Middle").id="MiddleFull";
	document.getElementById("Right").style.display="none";
	}

}	

function ShowColumn(){
	document.getElementById("MiddleFull").id="Middle";
	document.getElementById("Right").style.display="block";
}