function addit()
{
document.summing_smalfilm.s.value = parseInt(document.summing_smalfilm.a.value) * 30 + parseInt(document.summing_smalfilm.b.value) * 75
document.summing_videoband.s1.value = parseInt(document.summing_videoband.a1.value) * 4 + parseInt(document.summing_videoband.b1.value) * 75
}

function clearform()
{
document.summing_smalfilm.a.value= "0";
document.summing_smalfilm.b.value= "0";
document.summing_smalfilm.s.value= "0";
document.summing_videoband.a1.value= "0";
document.summing_videoband.b1.value= "0";
document.summing_videoband.s1.value= "0";
}