var obj_custom_checkbox;
function init(p){
	if(p == 'GE EN GÅVA'){
		var inputs = document.getElementsByTagName('input');
		var count = 0;
		for(i=0; i<inputs.length; i++){
			if(inputs[i].type == 'checkbox'){
				count++;
				if(count == 4){
					obj_custom_checkbox = inputs[i]
					window.addEvent('click', inputs[i], customGiftBox);
				}
			}
		}
	}
}

window.addEvent = function(event, target, method) {
	if (target.addEventListener) {
		target.addEventListener(event, method, false);
	} else if (target.attachEvent) {
		target.attachEvent("on" + event, method);
	}
}

function customGiftBox(){
	document.getElementById('gift_custom').style.visibility = (obj_custom_checkbox.checked) ? 'visible' : 'hidden';
}