function matCalc(form) {

quantity1=eval(form.quantity1.value)
form.size1.value=""
if(quantity1>=1)
{
b1=76.00
c1=quantity1*b1
form.subtotal1.value=c1
form.size1.value="2' x 4'"
}
if((quantity1<1) | (form.quantity1.value=="")){

	form.quantity1.value="0"
	if(form.subtotal1.value>0){
		form.subtotal1.value=""}
	}
	
quantity2=eval(form.quantity2.value)
form.size2.value=""
if(quantity2>=1)
{
b2=115.00
c2=quantity2*b2
form.subtotal2.value=c2
form.size2.value="2' x 6'"
}
if((quantity2<1) | (form.quantity2.value=="")){
	form.quantity2.value="0"
	if(form.subtotal2.value>0){
		form.subtotal2.value=""}
	}
	
quantity3=eval(form.quantity3.value)
form.size3.value=""
if(quantity3>=1)
{
b3=153.00
c3=quantity3*b3
form.subtotal3.value=c3
form.size3.value="2' x 8'"
}
if((quantity3<1) | (form.quantity3.value=="")){
	form.quantity3.value="0"
	if(form.subtotal3.value>0){
		form.subtotal3.value=""}
	}

quantity4=eval(form.quantity4.value)
form.size4.value=""
if(quantity4>=1)
{
b4=191.00
c4=quantity4*b4
form.subtotal4.value=c4
form.size4.value="2' x 10'"
}
if((quantity4<1) | (form.quantity4.value=="")){
	form.quantity4.value="0"
	if(form.subtotal4.value>0){
		form.subtotal4.value=""}
	}

quantity5=eval(form.quantity5.value)
form.size5.value=""
if(quantity5>=1)
{
b5=229.00
c5=quantity5*b5
form.subtotal5.value=c5
form.size5.value="2' x 12'"
}
if((quantity5<1) | (form.quantity5.value=="")){
	form.quantity5.value="0"
	if(form.subtotal5.value>0){
		form.subtotal5.value=""}
	}

quantity6=eval(form.quantity6.value)
form.size6.value=""
if(quantity6>=1)
{
b6=306.00
c6=quantity6*b6
form.subtotal6.value=c6
form.size6.value="2' x 16'"
}
if((quantity6<1) | (form.quantity6.value=="")){
	form.quantity6.value="0"
	if(form.subtotal6.value>0){
		form.subtotal6.value=""}
	}

quantity7=eval(form.quantity7.value)
form.size7.value=""
if(quantity7>=1)
{
b7=115.00
c7=quantity7*b7
form.subtotal7.value=c7
form.size7.value="3' x 4'"
}
if((quantity7<1) | (form.quantity7.value=="")){
	form.quantity7.value="0"
	if(form.subtotal7.value>0){
		form.subtotal7.value=""}
	}

quantity8=eval(form.quantity8.value)
form.size8.value=""
if(quantity8>=1)
{
b8=172.00
c8=quantity8*b8
form.subtotal8.value=c8
form.size8.value="3' x 6'"
}
if((quantity8<1) | (form.quantity8.value=="")){
	form.quantity8.value="0"
	if(form.subtotal8.value>0){
		form.subtotal8.value=""}
	}

quantity9=eval(form.quantity9.value)
form.size9.value=""
if(quantity9>=1)
{
b9=229.00
c9=quantity9*b9
form.subtotal9.value=c9
form.size9.value="3' x 8'"
}
if((quantity9<1) | (form.quantity9.value=="")){
	form.quantity9.value="0"
	if(form.subtotal9.value>0){
		form.subtotal9.value=""}
	}

quantity10=eval(form.quantity10.value)
form.size10.value=""
if(quantity10>=1)
{
b10=287.00
c10=quantity10*b10
form.subtotal10.value=c10
form.size10.value="3' x 10'"
}
if((quantity10<1) | (form.quantity10.value=="")){
	form.quantity10.value="0"
	if(form.subtotal10.value>0){
		form.subtotal10.value=""}
	}

quantity11=eval(form.quantity11.value)
form.size11.value=""
if(quantity11>=1)
{
b11=344.00
c11=quantity11*b11
form.subtotal11.value=c11
form.size11.value="3' x 12'"
}
if((quantity11<1) | (form.quantity11.value=="")){
	form.quantity11.value="0"
	if(form.subtotal11.value>0){
		form.subtotal11.value=""}
	}

quantity12=eval(form.quantity12.value)
form.size12.value=""
if(quantity12>=1)
{
b12=458.00
c12=quantity12*b12
form.subtotal12.value=c12
form.size12.value="3' x 16'"
}
if((quantity12<1) | (form.quantity12.value=="")){
	form.quantity12.value="0"
	if(form.subtotal12.value>0){
		form.subtotal12.value=""}
	}

sub1=eval(form.subtotal1.value)
sub2=eval(form.subtotal2.value)
sub3=eval(form.subtotal3.value)
sub4=eval(form.subtotal4.value)
sub5=eval(form.subtotal5.value)
sub6=eval(form.subtotal6.value)
sub7=eval(form.subtotal7.value)
sub8=eval(form.subtotal8.value)
sub9=eval(form.subtotal9.value)
sub10=eval(form.subtotal10.value)
sub11=eval(form.subtotal11.value)
sub12=eval(form.subtotal12.value)

matTotal=eval(form.grandTotal.value)

if(form.subtotal1.value=="") sub1=0
if(form.subtotal2.value=="") sub2=0
if(form.subtotal3.value=="") sub3=0
if(form.subtotal4.value=="") sub4=0
if(form.subtotal5.value=="") sub5=0
if(form.subtotal6.value=="") sub6=0
if(form.subtotal7.value=="") sub7=0
if(form.subtotal8.value=="") sub8=0
if(form.subtotal9.value=="") sub9=0
if(form.subtotal10.value=="") sub10=0
if(form.subtotal11.value=="") sub11=0
if(form.subtotal12.value=="") sub12=0


matTotal=(sub1+sub2+sub3+sub4+sub5+sub6+sub7+sub8+sub9+sub10+sub11+sub12)

form.grandTotal.value=matTotal


}