function poptell() {
        window.open("tellfriend.html","on_enter","toolbar=0,location=0,status=0,menubar=0,scrollbars=0,resizable=0,width=350,height=250,screenX=100,screenY=100,top=50,left=50");
}
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 calculate() {
//	var packs = parseInt(document.calcform.packs.value);
    var packs = document.calcform.packs.value
	var price = document.calcform.price.value;
	var time = parseInt(document.calcform.span[document.calcform.span.selectedIndex].value);
	if (validnum(time)) {
		if (validnum(price)) {
			var result = (packs * price * time);
			var whole = Math.floor(result);
			var cents = result - whole;
			cents = cents * 100;
			cents = Math.round(cents);
			if (cents == 100) {
				whole = whole + 1;
				cents = 0;
			}
			if (cents == 0) {
				cents = "00";
			}
			document.calcform.result.value = "$ " + whole + "." + cents;		
		}
		else {
			alert("Please enter a valid price per pack");
		}
	}
	else {
		alert("Please enter how many packs per day you smoke");
	}
}
	
function validnum(x) {
	if (x <= 0) {
		return false;
	}
	return true;
}