/* This function writes the protection code */
function place_protector(elem)//ent_id)
{
	//var elem=document.getElementById(elemenet_id);
	if(null==elem)
	{
		alert("APROTECT: No holder set");
		return;
	}
	
	elem.innerHTML='<span id="ap_1">'+Math.floor(Math.random()*100)+'</span> + <span id="ap_2">'+Math.floor(Math.random()*10)+'</span> = <input type="text" id="ap_3" style="width:30px"/>';
}

function check(err_elem)
{
	var ap1=document.getElementById("ap_1");
	var ap2=document.getElementById("ap_2");
	var ans=parseInt(ap1.innerHTML)+parseInt(ap2.innerHTML);
	var ap3=document.getElementById("ap_3").value;
	if(ap3!=ans)
	{
		err_elem.innerHTML="Неверный ответ";
		return false;
	}
	else
	{
		return true;
	}
}