function validate(form1) {
	var quantity = form1.quantity.value;
	
	if(isNaN(quantity)) {
		alert('Please enter a numeric value for the Quantity.');
		return false;

	} else if(quantity <= 0) {
		alert('Please enter a Quantity greater than zero.');
		return false;
		
	} else if(Math.floor(quantity) != quantity) {  // check for integer value
		alert("Sorry, we don't sell partial sets!\nPlease enter an integer value for the Quantity.");
		return false;		
	}
	
/*	
	
		} else if(!parseInt(quantity, 10) === quantity) {  // check for integer value
		alert("Sorry, we don't sell partial sets!\nPlease enter an integer value for the Quantity.");
		return false;		
	}
*/
}