Javascript function not working as expected
I am new to this, so please bear with me.
    
    <script type="text/javascript">
	function ReadForm(obj1) {
        "use strict";
		var amt = obj1.amount.value;
		obj1.amount.value = amt - (amt / 6.6);
	}
    </script>
The Amt is supposed to be 99 and the end result is supposed to be 84 (99/6.6).
Am I doing something wrong?
I have also tried this without the "use strict"; with the same result.
Javascript function not working as expected
===

I am new to this, so please bear with me.
    
    <script type="text/javascript">
	function ReadForm(obj1) {
        "use strict";
		var amt = obj1.amount.value;
		obj1.amount.value = amt - (amt / 6.6);
	}
    </script>
The Amt is supposed to be 99 and the end result is supposed to be 84 (99/6.6).
Am I doing something wrong?
I have also tried this without the "use strict"; with the same result.