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];}
}

function hideItem(itemNumber) {
	if(document.getElementById(itemNumber) != null){
		document.getElementById(itemNumber).style.display = 'none';
		document.getElementById(itemNumber).style.visibility = 'hidden';
		// toggle the colour to purple
		var nameelement = document.getElementById(itemNumber + "-btn");
		nameelement.style.color = "#8C709E"; // YOU need to change this to the CSS colour #33344 whatever
		nameelement.style.fontWeight = "normal";
	}
}

function showItem(itemNumber) {
    if(document.getElementById(itemNumber) != null){
		document.getElementById(itemNumber).style.display = 'block';
		document.getElementById(itemNumber).style.visibility = 'visible';
		// toggle the colour to black
		var nameelement = document.getElementById(itemNumber + "-btn");
		nameelement.style.color = "black";
		nameelement.style.fontWeight = "bold";
	}
}

function MM_openBrWindow(theURL,winName,features) { //v2.0
  window.open(theURL,winName,features);
}

//This function will calculate your Body Mass Index to 1 decimal place
function cal_bmi()
{	
	//declare variables
	var weight = document.form.weight.value
	var height = document.form.height.value
	
	h1= (height/100) //divide height by 100 to make it a percentage
	h2 = (h1 * h1) //square the height
	document.form.result.value = Math.round((weight/h2) *10)/10 //prints to 1 decimal place
	
	//return 
}