function calc(form)
{
if(form.oper1.value=="x"){s1=form.no1.value*form.no1a.value}
else if(form.oper1.value=="/"){s1=form.no1.value/form.no1a.value}
else if(form.oper1.value=="^"){s1=Math.pow(form.no1.value,form.no1a.value)}
else if(form.oper1.value=="sqrt"){s1=Math.sqrt(form.no1.value)}
else s1=N/A
form.r1.value=s1

if(form.oper2.value=="x"){s2=form.no2.value*form.no2a.value}
else if(form.oper2.value=="/"){s2=form.no2.value/form.no2a.value}
else if(form.oper2.value=="^"){s2=Math.pow(form.no2.value,form.no2a.value)}
else if(form.oper2.value=="sqrt"){s2=Math.sqrt(form.no2.value)}
else s2=N/A
form.r2.value=s2

if(form.oper3.value=="x"){s3=form.no3.value*form.no3a.value}
else if(form.oper3.value=="/"){s3=form.no3.value/form.no3a.value}
else if(form.oper3.value=="^"){s3=Math.pow(form.no3.value,form.no3a.value)}
else if(form.oper3.value=="sqrt"){s3=Math.sqrt(form.no3.value)}
else s3=N/A
form.r3.value=s3

if(form.oper4.value=="x"){s4=form.no4.value*form.no4a.value}
else if(form.oper4.value=="/"){s4=form.no4.value/form.no4a.value}
else if(form.oper4.value=="^"){s4=Math.pow(form.no4.value,form.no4a.value)}
else if(form.oper4.value=="sqrt"){s4=Math.sqrt(form.no4.value)}
else s4=N/A
form.r4.value=s4

}