function tape_sla_option_1() {
    reset_all_retentions();
	document.getElementById("retention1").style.display = "";
	document.getElementById("retention2").style.display = "none";
	document.getElementById("retention3").style.display = "";
	document.getElementById("retention4").style.display = "none";
}

function tape_sla_option_2() {
    reset_all_retentions();
	document.getElementById("retention1").style.display = "";
	document.getElementById("retention2").style.display = "";
	document.getElementById("retention3").style.display = "";
	document.getElementById("retention4").style.display = "none";
}

function tape_sla_option_3() {
    reset_all_retentions();
	document.getElementById("retention1").style.display = "";
	document.getElementById("retention2").style.display = "";
	document.getElementById("retention3").style.display = "";
	document.getElementById("retention4").style.display = "none";
}

function tape_sla_option_4() {
    reset_all_retentions();
	document.getElementById("retention1").style.display = "";
	document.getElementById("retention2").style.display = "none";
	document.getElementById("retention3").style.display = "none";
	document.getElementById("retention4").style.display = "";
}

function reset_all_retentions(){
	document.getElementById("retention1").style.display = "";
	document.getElementById("retention2").style.display = "";
	document.getElementById("retention3").style.display = "";
	document.getElementById("retention4").style.display = "";

}

function disable_other_optionals(){
  document.getElementById("optional1_yes").disabled=true;
  document.getElementById("optional1_no").disabled=true;
  document.getElementById("shortemail1").disabled=true;
  document.getElementById("shortemail2").disabled=true;
}

function calculate_price(){
  var price;
  var num;
  num=document.getElementById("NumTera").value;
  price=num*750;
  price=price+"";
  document.getElementById("InitCost").value=price;
  num=num+""; 
  document.getElementById("NumOfTera_2").value=num;
}