<!-- start hiding
//Written by Manuel Villanueva

function OR_IVF(form) {
if (form.charge[0].checked) {   
var answer = 4 * form.kg.value;
}
if (form.charge[1].checked) {
var answer = 6 * form.kg.value;
}
if (form.charge[2].checked) {   
var answer = 8 * form.kg.value;
}
if (form.charge[3].checked) {
var answer = 10 * form.kg.value;
}
if (form.charge[4].checked) {
var answer = 17 * form.kg.value;
}
form.answer.value = Math.round(10*answer)/10;
//alert
if((form.kg.value==null)||(form.kg.value=="")||(isNaN(form.kg.value))){
alert('Please enter a weight in kg with numbers only. Use a period for decimal place.');
form.kg.focus();
form.kg.select();
return false
}
}
// end hiding -->