function a_plus_b(form)
{
var final,cases,fob,fobtemp,freight,freighttemp,forwarding,miscel,misceltemp,forwardingtemp,insurance,insurancetemp,finance,financetemp,total,totaltemp,temp
     final=0
     fobtemp=0
     temp=0
     total=0
      
      var margintemp=0
      var tempprof=0
      var margin2=0

     cases=eval(form.cases.value)
     
     fob=eval(form.tfob.value)
     fobtemp=fob * cases
     form.fob.value = fobtemp
     
     freight=eval(form.tfreight.value)
     freighttemp=freight / cases
     form.freight.value = freighttemp
     
     forwarding=eval(form.tforwarding.value)
     forwardingtemp=forwarding / cases
     form.forwarding.value = forwardingtemp
     
     insurance=eval(form.tinsurance.value)
     insurancetemp=insurance / cases
     form.insurance.value = insurancetemp
     
     finance=eval(form.tfinance.value)
     financetemp=finance / cases
     form.finance.value = financetemp
     
     miscel=eval(form.miscel1.value)
     misceltemp=miscel / cases
     form.miscel.value = misceltemp

    
     temp=freight + forwarding + insurance + finance + miscel + fobtemp
     total=freighttemp + forwardingtemp + insurancetemp + financetemp + misceltemp + fob
     
     form.ttotal.value = temp
     form.total.value=total
     

  
   		
   		   tempprof = form.pmargin.value
   			margin2=temp/(100 -tempprof)
   			
   			form.sellingbox.value = margin2
   			form.sellingcase.value=margin2 / cases
			
			currcalc.amount.value=margin2;
}