function CheckAddToCart (form)
{
	for (i=0; i<form.elements.length; i++)
	{	
		if ((form.elements[i].name == "Quantity" && form.elements[i].value == "") || (form.elements[i].name == "Quantity" && isNaN(form.elements[i].value)))
    	{   
        	alert ("You didn't enter a quantity.")
        	form.elements[i].focus ()
        	return false
    	}
    }
    
	form.action = 'addtocart.asp'
}