function col(){
document.calc.Season.style.backgroundColor = '#ffffff';
document.calc.qty.style.backgroundColor = '#ffffff';
document.calc.Productline3.style.backgroundColor = '#ffffff';
document.calc.lang1.style.backgroundColor = '#ffffff';
document.calc.lang2.style.backgroundColor = '#ffffff';
document.calc.langdays.style.backgroundColor = '#ffffff';
document.calc.organisation.style.backgroundColor = '#ffffff';
}
function col1(){
document.calc.Travel.style.backgroundColor = '#ffffff';
document.calc.Course.style.backgroundColor = '#ffffff';
}
function col2(){
document.calc.Students.style.backgroundColor = '#ffffff';
document.calc.Staff.style.backgroundColor = '#ffffff';
}
function col3(){
document.calc.Students1.style.backgroundColor = '#ffffff';
document.calc.Staff1.style.backgroundColor = '#ffffff';
}
function col4(){
document.calc.Worksheets.style.backgroundColor = '#ffffff';
}