function compute(form)  {
   var milesPerMo = form.avgMiles.value *30.4;
   var mpgcalc = ((form.endOd.value - form.begOd.value) / form.gallons.value);
   var moGascalc = (((form.avgMiles.value * 30.4) / mpgcalc) * form.ppGal.value);
   form.mpg.value = mpgcalc;
   form.moGas.value = moGascalc;
   form.yrGas.value = moGascalc * 12;
   
   if(form.mpg2.value > 0) {
              var moGas2calc = ((milesPerMo / form.mpg2.value) * form.ppGal.value);
              form.moGas2.value = moGas2calc;
              form.yrGas2.value =  moGas2calc * 12;
              var annualsave = form.yrGas.value - form.yrGas2.value;
              form.save.value = ("If you switch to a car that gets " + form.mpg2.value + " mpg, you'll save $" + parseInt(annualsave,10) + " per year.")
              }
              else {
              form.moGas2.value = "";
              form.yrGas2.value = "";
              form.save.value = ("Now enter a higher mpg to compare to your car's present mpg.");
              }
   } 

function ClearForm(form)  {
   form.begOd.value = "";
   form.endOd.value = "";
   form.avgMiles.value = "";
   form.gallons.value = "";
   form.ppGal.value = "";
   form.mpg.value = "";
   form.moGas.value = "";
   form.yrGas.value = "";
   form.mpg2.value = "";
   form.moGas2.value = "";
   form.yrGas2.value = "";
   form.save.value = "";
   
}

function validate_contact(form){
	if (form.fname.value==''){
 	 alert('Please enter first name!');
	 return false;
 	}
	if (form.phone.value==''){
 	 alert('Please enter a telephone number!');
	 return false;
 	}
	if (form.email.value==''){
 	 alert('Please enter a valid email address!');
	 return false;
 	}
}

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];}
}