Form Processing Problem

Hi
I have a form that use a js file to validate form fields. One of this fileld is a number that must be five multilple , but this error for even number that are five multiple such 55.
This is my code:

var myVariable = frm.withdraw.value / 5;
	
	if (myVariable != 0) {
		showError("Invalid amount")
		frm.withdraw.focus()
		frm.withdraw.select()
		return false
	}

Code (markup):

Where is problem??!

 

I think you should use

 

It can't work like that, you will get true for every number greater 4.
For Example: myVar = 55 / 5;
Result is 11, and 11 is != 0

Try this:

var myVariable = parseInt(frm.withdraw.value) % 5;
	
if (myVariable != 0) {
	showError("Invalid amount")
	frm.withdraw.focus()
	frm.withdraw.select()
	return false
}

Code (markup):