function tSwap(swapNum){


		
	for(var i=1;i<13;i++){
	if (i==swapNum)
	document.getElementById("swap" + i ).style.display ="block";
	else
	document.getElementById("swap" + i).style.display ="none";
	}

}

//function tSwap_bk_txt(){
//document.getElementById("swap10").style.visibility ="visible";
//}