function joinFields( ){
// are the checkboxes checked? 
if (fmBuy.custom1.checked == 0 ) {fmBuy.custom1.value="";}
else {fmBuy.custom1.value = fmBuy.custom1.value + ",";}

if (fmBuy.custom2.checked == 0 ) {fmBuy.custom2.value="";}
else {fmBuy.custom2.value = fmBuy.custom2.value + ",";}

if (fmBuy.custom3.checked == 0 ) {fmBuy.custom3.value="";}
else {fmBuy.custom3.value = fmBuy.custom3.value + ",";}

if (fmBuy.custom4.checked == 0 ) {fmBuy.custom4.value="";}
else {fmBuy.custom4.value = fmBuy.custom4.value + ",";}

// Combine the values
fmBuy.os0.value = fmBuy.custom1.value + fmBuy.custom2.value + fmBuy.custom3.value + fmBuy.custom4.value
}

function joinFields1( ){
// are the checkboxes checked? 
if (fmBuy1.custom1.checked == 0 ) {fmBuy1.custom1.value="";	}
else {fmBuy1.custom1.value = fmBuy1.custom1.value + ",";
}

if (fmBuy1.custom2.checked == 0 ) {fmBuy1.custom2.value="";}
else {fmBuy1.custom2.value = fmBuy1.custom2.value + ",";}

if (fmBuy1.custom3.checked == 0 ) {fmBuy1.custom3.value="";}
else {fmBuy1.custom3.value = fmBuy1.custom3.value + ",";}

if (fmBuy1.custom4.checked == 0 ) {fmBuy1.custom4.value="";}
else {fmBuy1.custom4.value = fmBuy1.custom4.value + ",";}

// Combine the values
fmBuy1.os0.value = fmBuy1.custom1.value + fmBuy1.custom2.value + fmBuy1.custom3.value + fmBuy1.custom4.value
}