function addToCart(t_size) {
	if(document.layers){
		document.os0.value = t_size;
		document.hidden_form.submit();
	}
	if(document.all){
		document.all.os0.value = t_size;
		document.all.hidden_form.submit();
	}
	if(!document.all && document.getElementById){
		document.getElementById("os0").value = t_size;
		document.getElementById("my_form").submit();
	}
}