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to the very best of my knowledge, there is no isNumeric function in javascript. there's isNaN, though, which will return true if the argument its passed isn't a number.
try this:
if (isNan(var1)) { alert ("Please enter number for (a)");}
else { document.form1.Answer.value = result; }
if (isNaN(var2)) { alert ("please enter number for (b)"); }
else { document.form1.Answer.value = result; }
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