function ValidatePurchaseValue() {
	
	var testValue = document.purchase_form['purchase_value'].value;
	var confirmed = false;
	
	if(parseInt(testValue) != 0) {
		// number is valid, confirm purchase
		confirmed = confirm("Are you sure you want to purchase $" + testValue + " of print credits?\n\nYour HWS account will be charged.\n\n");
		return confirmed;
	}
	else {
		alert("Please select an amount.");
		return false;
	}
}