function SizeCalc(form) 
{

if (form.a1.value==null||form.a1.value.length==0){
        alert("Please enter the number of attendees at the top of the form.");
        return false;}
        else

form.suba.value = (form.a2.value) * (form.a3.value) * (form.a4.value);
form.subb.value = ((form.b1.value)*1) + ((form.b2.value)* 1) + ((form.b3.value)* 1) + ((form.b4.value) * 1) + ((form.b5.value)* 1) + ((form.b6.value)*1);

form.subc.value = ((form.ca1.value)*1) + ((form.ca2.value)*1) + ((form.ca3.value)*1) + ((form.ca4.value)*1) + ((form.ca5.value)*1) + ((form.ca6.value)*1) + ((form.ca7.value)*1) + ((form.ca8.value)*1) + ((form.ca9.value)*1) + ((form.ca10.value)*1) + (((form.cb1.value)*1) *  ((form.cb2.value)*1) * ((form.a1.value)*1)) + (((form.cc1.value)*1) * ((form.cc2.value)*1)) + ((form.cd1.value)*1) + ((form.cd2.value)*1) + ((form.cd3.value)*1) + ((form.cd4.value)*1) + ((form.cd5.value)*1) + ((form.cd6.value)*1) + ((form.cd7.value)*1) + ((form.ce1.value)*1) + ((form.ce2.value)*1) + ((form.ce3.value)*1) + ((form.ce4.value)*1) + ((form.ce5.value)*1) + (((form.cf1.value)*1) * ((form.cf2.value)*1)) + (((form.cf1.value)*1) * ((form.cf3.value)*1)) + (((form.cg1.value)*1) * ((form.cg2.value)*1) * ((form.cg3.value)*1)) + ((form.ch1.value)*1) + ((form.ch2.value)*1) + ((form.ch3.value)*1)+ ((form.ch4.value)*1) + ((form.ch5.value)*1) + ((form.ch6.value)*1) + ((form.ci1.value)*1) + ((form.ci2.value)*1) + ((form.ci3.value)*1) + ((form.ci4.value)*1) + ((form.ci5.value)*1);
form.subca.value = ((form.ca1.value)*1) + ((form.ca2.value)*1) + ((form.ca3.value)*1) + ((form.ca4.value)*1) + ((form.ca5.value)*1) + ((form.ca6.value)*1) + ((form.ca7.value)*1) + ((form.ca8.value)*1) + ((form.ca9.value)*1) + ((form.ca10.value)*1); 
form.subcb.value = (((form.cb1.value)*1) *  ((form.cb2.value)*1) * ((form.a1.value)*1));
form.subcc.value = (((form.cc1.value)*1) * ((form.cc2.value)*1));
form.subcd.value = ((form.cd1.value)*1) + ((form.cd2.value)*1) + ((form.cd3.value)*1) + ((form.cd4.value)*1) + ((form.cd5.value)*1) + ((form.cd6.value)*1) + ((form.cd7.value)*1);
form.subce.value = ((form.ce1.value)*1) + ((form.ce2.value)*1) + ((form.ce3.value)*1) + ((form.ce4.value)*1) + ((form.ce5.value)*1);
form.subcf.value = (((form.cf1.value)*1) * ((form.cf2.value)*1)) + (((form.cf1.value)*1) * ((form.cf3.value)*1));
form.subcg.value = (((form.cg1.value)*1) * ((form.cg2.value)*1) * ((form.cg3.value)*1));
form.subch.value = ((form.ch1.value)*1) + ((form.ch2.value)*1) + ((form.ch3.value)*1)+ ((form.ch4.value)*1) + ((form.ch5.value)*1) + ((form.ch6.value)*1);
form.subci.value = ((form.ci1.value)*1) + ((form.ci2.value)*1) + ((form.ci3.value)*1)+ ((form.ci4.value)*1) + ((form.ci5.value)*1);

form.subd.value = ((form.a1.value) * (form.da1.value) * (form.da2.value)) + ((form.a1.value) * (form.db1.value) * (form.db2.value)) + ((form.a1.value) * (form.dc1.value) * (form.dc2.value)) + ((form.a1.value) * (form.dd1.value) * (form.dd2.value));
form.subda.value = ((form.a1.value) * (form.da1.value) * (form.da2.value));
form.subdb.value = ((form.a1.value) * (form.db1.value) * (form.db2.value));
form.subdc.value = ((form.a1.value) * (form.dc1.value) * (form.dc2.value));
form.subdd.value = ((form.a1.value) * (form.dd1.value) * (form.dd2.value));

form.sube.value = ((form.ea2.value) * (form.ea3.value) * (form.ea4.value)) + ((form.ea5.value) * (form.ea1.value)) + ((form.ea6.value)*1) + ((form.ea7.value) * (form.ea1.value)) + ((form.eb1.value) * (form.eb2.value)) + ((form.eb3.value)*1) + ((form.eb4.value)* (form.eb1.value));
form.subea.value = ((form.ea2.value) * (form.ea3.value) * (form.ea4.value)) + ((form.ea5.value) * (form.ea1.value)) + ((form.ea6.value)*1) + ((form.ea7.value) * (form.ea1.value));
form.subeb.value = ((form.eb1.value) * (form.eb2.value)) + ((form.eb3.value)*1) + ((form.eb4.value) * (form.eb1.value));

form.total.value = ((form.suba.value)*1) + ((form.subb.value)*1) + ((form.subc.value)*1) + ((form.subd.value)*1) + ((form.sube.value)*1);
form.average.value = ((form.total.value)*1) / ((form.a1.value)*1);
form.suba2.value = ((form.suba.value)*1);
form.subb2.value = ((form.subb.value)*1);
form.subc2.value = ((form.subc.value)*1);
form.subd2.value = ((form.subd.value)*1);
form.sube2.value = ((form.sube.value)*1);
return true;
}