<!--
function setQuantity(pcID, pnOperation, pnMin, pnMax)
{
	var lnCurrentQuantity = parseInt(document.getElementById(pcID).value);							  
	var lnNewQuantity     = lnCurrentQuantity ; 
	switch(pnOperation)
	{				   
		case 1: // increase quantity by 1 
			lnNewQuantity++	;
			if(lnNewQuantity > pnMax)
			{								
				lnNewQuantity = lnCurrentQuantity ;
			}
			break;
		case 2:// decrease quantity by 1
			lnNewQuantity-- ;
			if(lnNewQuantity < pnMin) 
			{
				lnNewQuantity = lnCurrentQuantity ;
			}
			break;
		default:// ensuring a typed quantity remains within the parameters defined
			if (lnCurrentQuantity > pnMax || lnCurrentQuantity < pnMin)
			{									 
				alert("Please set the quantity as a number between " + pnMin + " and " + pnMax + '\n' + "The quantity will now be set to " + pnMin) ;
				lnNewQuantity = pnMin ;
			}
			break;
	}

	document.getElementById(pcID).value = lnNewQuantity ;
}		
// -->