var reg_field_accept;
var reg_button;
var reg_disablesend = function() {
	reg_field_accept = document.getElementById("acceptterms");
	reg_button = document.getElementById("regbtn");
	if(reg_field_accept.checked==false) {
		reg_button.disabled = "disabled";
		reg_button.className = "disabled";
	}
	reg_field_accept.onclick = function() {
		if(this.checked==true) {
			reg_button.disabled = false;
			reg_button.className = "btn";
		} else {
			reg_button.disabled = "disabled";
			reg_button.className = "disabled";
		}
	}
}

addEvent(window,"load",reg_disablesend);