Please help

Hi when i put the code CTGATGACATAGACA in , Why does my alert box say start codon not found insted of postion 3.
This is the code i am working to

function findStartCodon(someBases, startingPlace) {

var startCodonAt = -1;
var aCodon = ”;
var codonFound = false;

while ((codonFound == false) && ((startingPlace + 3) <= someBases.length)) {

aCodon = someBases.substring(startingPlace, startingPlace + 3);

if (aCodon == ‘ATG’) {

startCodonAt = startingPlace;
codonFound = true;
} else {

startingPlace = startingPlace + 3;
}
}

return (startCodonAt);
}

function testFindStartCodon() {

var startCodonAt = -1;

var someGeneticInfo = this.document.testForm.sequenceString.value;

startCodonAt = findStartCodon(someGeneticInfo);

if (startCodonAt != -1) {

window.alert(“The beginning of the start codon is at position ” + startCodonAt + “.”);
}else {

window.alert (“The start codon was not found in this sequence.”);
}
}

Would be gratefull of any help
Daz

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