/*****************************************************************************************
** Twyford School - js file **************************************************************
*****************************************************************************************/


/*****************************************************************************************
** Image Functions ***********************************************************************
*****************************************************************************************/
function MM_swapImgRestore() { //v3.0
  var i,x,a=document.MM_sr; for(i=0;a&&i<a.length&&(x=a[i])&&x.oSrc;i++) x.src=x.oSrc;
}

function MM_preloadImages() { //v3.0
  var d=document; if(d.images){ if(!d.MM_p) d.MM_p=new Array();
    var i,j=d.MM_p.length,a=MM_preloadImages.arguments; for(i=0; i<a.length; i++)
    if (a[i].indexOf("#")!=0){ d.MM_p[j]=new Image; d.MM_p[j++].src=a[i];}}
}

function MM_findObj(n, d) { //v4.01
  var p,i,x;  if(!d) d=document; if((p=n.indexOf("?"))>0&&parent.frames.length) {
    d=parent.frames[n.substring(p+1)].document; n=n.substring(0,p);}
  if(!(x=d[n])&&d.all) x=d.all[n]; for (i=0;!x&&i<d.forms.length;i++) x=d.forms[i][n];
  for(i=0;!x&&d.layers&&i<d.layers.length;i++) x=MM_findObj(n,d.layers[i].document);
  if(!x && d.getElementById) x=d.getElementById(n); return x;
}

function MM_swapImage() { //v3.0
  var i,j=0,x,a=MM_swapImage.arguments; document.MM_sr=new Array; for(i=0;i<(a.length-2);i+=3)
   if ((x=MM_findObj(a[i]))!=null){document.MM_sr[j++]=x; if(!x.oSrc) x.oSrc=x.src; x.src=a[i+2];}
}
/*****************************************************************************************
*****************************************************************************************/



/*****************************************************************************************
** Validation Functions ******************************************************************
*****************************************************************************************/
function CheckExists(id) {
	if(document.getElementById(id) != null) {
		return true;
	}
	else {
		return false;
	}

}
function CheckEmail(email) {
	var reg1 = /(@.*@)|(\.\.)|(@\.)|(\.@)|(^\.)/; // not valid
	var reg2 = /^.+\@(\[?)[a-zA-Z0-9\-\.]+\.([a-zA-Z]{2,3}|[0-9]{1,3})(\]?)$/; // valid
	if (!reg1.test(email) && reg2.test(email)) { // if syntax is valid
		return true;
	}
	else {
		return false;
	}
}


function ChangeTotal(dropdownVal, hdnVal) {
	var newNo = document.getElementById(dropdownVal);
	var oldNo = document.getElementById('hdn' + dropdownVal);
	var price = document.getElementById(hdnVal);
	var total = document.getElementById('txtTotal');
	
	if((newNo.value * 1) > (oldNo.value * 1)) {
		total.value = (total.value * 1) + (((newNo.value * 1) - (oldNo.value * 1)) * (price.value * 1));
		oldNo.value = newNo.value;
	}
	else if((newNo.value * 1) < (oldNo.value * 1)) {
		total.value = (total.value * 1) - (((oldNo.value * 1) - (newNo.value * 1)) * (price.value * 1));
		oldNo.value = newNo.value;
	}
	
	if((newNo.value * 1) > 0) {
		newNo.style.background='lightyellow';
	}
	
	// Update amount
	document.getElementById('hdnAmount').value = total.value;
}
/*****************************************************************************************
*****************************************************************************************/