Comments by ahmed whba (Top 1 by date)

note all text boxes has to be decalred then ,,, function calc(){ var a1,a2,a3,a4,a5,total,pp; //It gives error while taking the value of "txtAmount1" in a1 variable. //same for a1,a2,a3,a4,a5 a1=document.getElementById('').value; a2=document.getElementById('').value; a3=document.getElementById('').value; a4=document.getElementById('').value; a5=document.getElementById('').value; total=parseInt(a1)+parseInt(a2)+parseInt(a3)+parseInt(a4)+parseInt(a5); document.getElementById('').value=total; } enjoy it