my counter won’t count on Fx

hello

this is my counter

[code]
var agt=navigator.userAgent.toLowerCase();
function sz(t) {
a = t.value.split(‘n’);

b=1;
for (x=0;x < a.length; x++) {
if (a[x].length >= t.cols) b+= Math.floor(a[x].length/t.cols);
}
b+= a.length;
//if (b > t.rows && agt.indexOf(‘opera’) == -1)
if(b<5)
t.rows = b;

}

// now i make counting for total chars and total number of msgs according to the language of msg 1=unicoded 0=normal
function unicode(strText)

{

str = “”;

for (i=0; i<strText.length; i++)

if (str.indexOf(strText.charAt(i)) != -1)

return 1;

return 0;

}

unction charPlus()
{
strLen = SMSForm.message.value.length;
SMSForm.numChars.value = strLen;
if (unicode(SMSForm.message.value))
{
SMSForm.unicode1.value = 1;
numChar=SMSForm.message.value.length;
counterI=0;
if(numChar>70)
while(numChar>0)
{
numChar -=67;
counterI++;
}
else
counterI++;
SMSForm.numMsgs.value = counterI;
}
else
{
SMSForm.unicode1.value = 0;
numChar=SMSForm.message.value.length;
counterI=0;
if(numChar>160)
while(numChar>0)
{
numChar -=134;
counterI++;
}
else
counterI++;

SMSForm.numMsgs.value = counterI;
}

}
[/code]

works fine with ie , opera , everything but Firefox

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