window.onload =initAll;
   
   function initAll() {
      var theprice = 249;
      document.getElementById("promo").onchange = changeText;
      document.getElementById("term").onchange = changeText;
      document.getElementById("suboption").onchange = changeText;
	  for (var i=0; i< document.forms.length; i++) {
		document.forms[i].onsubmit = function() {return validForm();}
	  }
   }
      
   function changeText() {
	  var theprice = 249;
	  var suboption = document.getElementById("suboption").value;
	  
	  switch(suboption) {
      case "249":
	     var theprice = 249;
		 break;
      case "195":
	     var theprice = 195;
	     break;
      case "597":
	     var theprice = 597;
	     break;
      case "495":
	     var theprice = 495;
		 break;
      case "119":
	     var theprice = 119;
		 break;
      }
	  
	  var textinside = document.getElementById("promo").value;
	  
	  switch(textinside) {
      case "tbs101":
	     var offername =" with the promotional code entered";
         price = Math.floor(theprice * 0.85);
	     break;
      case "tbs102":
	     var offername =" with the promotional code entered";
         price = Math.floor(theprice * 0.9);
	     break;
      case "EA10":
	     var offername =" with the promotional code entered";
         if (theprice>400) {
            price = Math.floor(theprice - 100);
         } else {
            price = theprice;
         }
	     break;
      default:
	     var offername ="";
         price = theprice;
      }
	  
	  var textinside2 = document.getElementById("term").value;
	  
	  switch(textinside2) {
      case "one":
	     var discount = 1;
         var discountmess = "";
		 var newprice = price;
	     break;
      case "two":
	     var discount = 0.9;
		 var newprice = Math.ceil((price * discount) * 2);
		 var discountmess = "<br /><br />Subscribing for two years brings the annual subscription rate down to &#163;" + Math.ceil(price * discount) + " giving a total order value of &#163;" + newprice;
	     break;
      case "three":
	     var discount = 0.78;
		 var newprice = Math.ceil((price * discount) * 3);
		 var discountmess = "<br /><br />Subscribing for three years brings the annual subscription rate down to &#163;" + Math.ceil(price * discount) + " giving a total order value of &#163;" + newprice;
	     break;
      default:
      }
	 	  
	  document.getElementById("ordervalue").innerHTML="The price of the subscription order is &#163;" + price + offername + discountmess; 
	  document.getElementById("subsub").value ="Please invoice my organisation for £" + newprice; 
	  document.getElementById("hidden").value ="The total price of the subscription is £" + newprice; 
   }



function validForm() {
	var allGood = true;
	var allTags = document.getElementsByTagName("*");

	for (var i=0; i<allTags.length; i++) {
		if (!validTag(allTags[i])) {
			allGood = false;
		}
	}
	
    if (document.subform.terms.checked == false ) {
	    document.getElementById("termsdisplay").innerHTML="Please check the terms and conditions box<br />"; 
        allGood = false;
    } 
	
	if ((document.subform.terms.checked == true ) && (allGood == false)) {
	    document.getElementById("termsdisplay").innerHTML=""; 
	}
	
	return allGood;
	

	function validTag(thisTag) {
		var outClass = "";
		var allClasses = thisTag.className.split(" ");
	
		for (var j=0; j<allClasses.length; j++) {
			outClass += validBasedOnClass(allClasses[j]) + " ";
		}
	
		thisTag.className = outClass;
	
		if (outClass.indexOf("invalid") > -1) {
		    invalidLabel(thisTag.parentNode);
			thisTag.focus();
			if (thisTag.nodeName == "INPUT") {
				thisTag.select();
			}
			return false;
		}
		return true;
		
		function validBasedOnClass(thisClass) {
			var classBack = "";
		
			switch(thisClass) {
				case "":
				case "invalid":
					break;
				case "reqd":
					if (allGood && thisTag.value == "") classBack = "invalid ";
					classBack += thisClass;
					break;
				default:
					classBack += thisClass;
			}
			return classBack;
		}
		
		function invalidLabel(parentTag) {
		    if (parentTag.nodeName == "P") {
			    parentTag.className += " invalid";
			}
		}
		
	}
}