Javascript - validation, numbers only

 jQuery('.decimal').on('keydown', function (event) {return isNumberOveride(event, this);});

function isNumberOveride(evt, element) {
	var charCode = (evt.which) ? evt.which : evt.keyCode;
	if ((charCode != 190 || $(element).val().indexOf('.') != -1) // “.” CHECK DOT, AND ONLY ONE.
	&& (charCode != 110 || $(element).val().indexOf('.') != -1) // “.” CHECK DOT, AND ONLY ONE.
	&& ((charCode < 48 && charCode != 8)
	|| (charCode > 57 && charCode < 96)
	|| charCode > 105))
	return false;
	return true;
	}