var inTopic=0;
var inContent=0;

function enterTopic (number)
{
 document.getElementById("content"+number).style.visibility="visible";
 document.getElementById("photoBox"+number).style.opacity=0.2;

 inContent=0;
 inTopic=number;
 
}

function enterContent (number)
{
 document.getElementById("content"+number).style.visibility="visible";
   
 inContent=number;
 inTopic=0;
 
}

function closeFromContent (number)
{
 if (inTopic==number) 
	{
 		return;
 	}
 else
 	{
 		document.getElementById("content"+number).style.visibility="hidden";
		document.getElementById("photoBox"+number).style.opacity=1;

 		inContent=0;
 		
 	}
}

function closeFromTopic (number)
{
 if (inContent==number) 
 	{
 		return;
 	}
 else
 	{
 		document.getElementById("content"+number).style.visibility="hidden";
		document.getElementById("photoBox"+number).style.opacity=1;

 		inTopic=0;
 		
 	}
}