<!-- validation.js -->

function isNumeric(number)
	{
	if(isNaN(number))
		{
		alert("The Quantity field must contain a number.")
		return false;
		}
	else
		{
		return true;
		}
	}

function isGreaterThanZero(number)
	{
	if(number>0)
		{
		return true;
		}
	else
		{
		alert("Please enter a number greater than zero in order to add copies to your shopping cart.")
		return false;
		}
	}

function isFieldNumeric(field)
	{
	if((isNaN(field.value))||(field.value=="")||(field.value<0))
		{
		alert("The Quantity field must contain a non-negative number.")
		field.focus()
		return false;
		}
	else
		{
		return true;
		}
	}

function disableEnterKey()
	{
	// Check if key press is equal to ENTER and then disable it
	if (window.event.keyCode == 13)
		{
		window.event.keyCode=0
		} 
	}      

function selectCountry(form,targetURL,random)
	{
	form.action=targetURL+"?id="+random
	if(form.country.options.selectedIndex==0)
		{
		alert("You must select a Country/Region in order to continue")
		return false;
		}
	else
		{
		return true;
		}
	}