function insertatcursor(myField, myValue) {
if (document.selection) {
myField.focus();
sel = document.selection.createRange();
sel.text = myValue;
}
else if (myField.selectionStart == 0 || myField.selectionStart == '0') {
var startPos = myField.selectionStart;
var endPos = myField.selectionEnd;
myField.value = myField.value.substring(0,startPos) + myValue + myField.value.substring(endPos, myField.value.length);
}
else {
myField.value += myValue;
}
}