function Fmt(x) { 
var v
if(x>=0) { v=''+(x+0.00005) } else { v=''+(x-0.00005) }
return v.substring(0,v.indexOf('.')+3) 
}

function compute(form) { 
if((form.weeks.value==null)||(form.weeks.value=="")||(isNaN(form.weeks.value))){
alert('Please enter the gestational age in weeks.');
return false;
}


form.uasd95.value=Fmt((0.005*Math.pow(form.weeks.value,2))-(0.4361*form.weeks.value) +12.632);
form.uasd50.value=Fmt((63.131*Math.pow(form.weeks.value,-.9125)));




form.uari95.value= Fmt((.0001*(form.weeks.value)*(form.weeks.value))-(0.015*form.weeks.value)+1.1262);
form.uari50.value= Fmt((.00006*(form.weeks.value)*(form.weeks.value))-(0.0146*form.weeks.value)+1.0244);



form.uapi95.value=Fmt((-0.000009*Math.pow(form.weeks.value,3))+(0.0014*Math.pow(form.weeks.value,2))-(0.0853*form.weeks.value) +2.8347);
form.uapi50.value=Fmt((-0.7459*Math.log(form.weeks.value)+3.4923))

	 }




 function ClearForm(form)  {
	 form.weeks.value= "";
	 form.uasd95.value= "";
	form.uari95.value= "";
	form.uapi95.value= "";
	 form.uasd50.value= "";
	form.uari50.value= "";
	form.uapi50.value= "";

	 }