var	tm=new Array(false, false, false, false),
		timerID=new Array(4);

function showBox(idx) {
var i,bx;
for(i=0;i<4;i++) if (tm[i] && (i!=idx)) hideBox(i);
if(document.getElementById) document.getElementById("tm"+idx).style.visibility='visible';
else if (document.all) eval("document.all.tm"+idx+".style.visibility='visible';");
else if (document.layers) eval("document.tm"+idx+".visibility='visible';");
tm[idx]=true;
timerID[idx]=setTimeout("hideBox("+idx+")",8000);
return;
}


function hideBox(idx) {
clearTimeout(timerID[idx]);
if(document.getElementById) document.getElementById("tm"+idx).style.visibility='hidden';
else if (document.all) eval("document.all.tm"+idx+".style.visibility='hidden';");
else if (document.layers) eval("document.tm"+idx+".visibility='hidden';");
tm[idx]=false;
return;
}

function imgOver(imgHndl) {
imgHndl.src=imgHndl.src.substr(0,imgHndl.src.length-4)+"ov"+imgHndl.src.substr(imgHndl.src.length-4);
return;
}

function imgOut(imgHndl) {
imgHndl.src=imgHndl.src.substr(0,imgHndl.src.length-6)+imgHndl.src.substr(imgHndl.src.length-4);
return;
}