Running Total with Multiple Radio Button Options

A am trying to run a tally of questions results from mulitple (25)radio option form fields using if/else if. Seems to work, but does not compute correctly.

Probably made a stupid mistake as usual. Pleas respond to my email address at: [email protected]

Thanks -->Rick

============= function scorequiz(form) {
tally=0
if(form.Q1.value!=null && form.Q1.value=="1") {tally=tally+1};
else if(form.Q1.value!=null && form.Q1.value=="2") {tally=tally+2};
else if(form.Q1.value!=null && form.Q1.value=="3") {tally=tally+3}
else if(form.Q1.value!=null && form.Q1.value=="4") {tally=tally+4};
if(form.Q2.value!=null && form.Q2.value=="1") {tally=tally+1};
else if(form.Q2.value!=null && form.Q2.value=="2") {tally=tally+2};
else if(form.Q2.value!=null && form.Q2.value=="3") {tally=tally+3};
else if(form.Q2.value!=null && form.Q2.value=="4") {tally=tally+4};
if(form.Q3.value!=null && form.Q3.value=="1") {tally=tally+1}
else if(form.Q3.value!=null && form.Q3.value=="2") {tally=tally+2}
else if(form.Q3.value!=null && form.Q3.value=="3") {tally=tally+3}
else if(form.Q3.value!=null && form.Q3.value=="4") {tally=tally+4}

<snip> Etc. to 25, then...

form.SCORE.value =eval(tally)
}

Radio Buttons look like this:

<INPUT TYPE="radio" NAME="Q1" value="1" onclick=Q1.value="1">Strongly Disagree<br>
<INPUT TYPE="radio" NAME="Q1" value="2" onclick=Q1.value="2">Disagree<br>
<INPUT TYPE="radio" NAME="Q1" value="3" onclick=Q1.value="3">Agree<br>
<INPUT TYPE="radio" NAME="Q1" value="4" onclick=Q1.value="4">Strongly Agree</font>
</

Command button into a field box:

<INPUT TYPE="button" NAME="submit" VALUE="Compute Quiz tally" onclick=scorequiz(this.form)>