function validateNumeric(strValue) {
	var objRegExp  =  /(^-?\d\d*\.\d*$)|(^-?\d\d*$)|(^-?\.\d\d*$)/;
	return objRegExp.test(strValue);
}
<!--
function check_form() {
    var error_message = 'Errors have occured during the process of your form!\nPlease make the following corrections:\n\n';
    var error = 0;

    var payment_length = document.payment.payment.length;

    var count = 0;

	if (payment_length != undefined) {
		for(var x = 0; x < payment_length; x++) {
    	    if(document.payment.payment[x].checked) {
   	    	    count++;
	       	}
		}
	} else {
		count++;
	}

    if(count == 0) {
        error_message = error_message + 'You must choose a Payment Method';
        error = 1;
    }



    if (error == 1) {
        alert(error_message);
        return false;
    } else {
        return true;
    }
}

//-->