var timerlen = 5;
var slideAniLen = 500;

var timerID = new Array();
var startTime = new Array();
var obj = new Array();
var endHeight = new Array();
var moving = new Array();
var dir = new Array();

var mode = 'on';
var thetimer;





function doFlash(){

if(mode=='on'){
	document.title = '*** New Instant Message ***';
	mode = 'off';
	}
	
else{
	document.title = 'TeacherStudio';
	mode = 'on';
	}
}



function flashTitle(mode){

thetimer = setInterval("doFlash(mode)",1000);
	
}
	
	

function slidedown(objname,message,user){

var splitMsg = message.split('[aid]');
var innerDiv = document.getElementById('mydiv2');

if(moving[objname]) return;

if(splitMsg[1]!=user) flashTitle();

if(document.getElementById(objname).style.display != "none"){//if currently visible, add messg then return
	if(message){
	innerDiv.innerHTML += message;
	document.getElementById("mydiv2").scrollTop= 500;
	}
return;
}
	
moving[objname] = true;
dir[objname] = "down";
startslide(objname,message);
}



function slideup(objname){

if(moving[objname]) return;

if(document.getElementById(objname).style.display == "none") return; // cannot slide up something that is already hidden

moving[objname] = true;
dir[objname] = "up";
startslide(objname);
}



function startslide(objname,message){

var innerDiv = document.getElementById('mydiv2');

obj[objname] = document.getElementById(objname);
endHeight[objname] = parseInt(obj[objname].style.height);
startTime[objname] = (new Date()).getTime();

if(dir[objname] == "down"){
	obj[objname].style.height = "1px";
	}

obj[objname].style.display = "block";

if(message) {
	innerDiv.innerHTML = message;
	}

innerDiv.style.height = "1px";//NEW
timerID[objname] = setInterval('slidetick(\'' + objname + '\');',timerlen);
}




function slidetick(objname){

var elapsed = (new Date()).getTime() - startTime[objname];

if (elapsed > slideAniLen) endSlide(objname);

else {
    var d =Math.round(elapsed / slideAniLen * endHeight[objname]);
	
	if(dir[objname] == "up") d = endHeight[objname] - d;
	obj[objname].style.height = d + "px";
	}

return;
}





function endSlide(objname){

var innerDiv = document.getElementById('mydiv2');

clearInterval(timerID[objname]);

if(dir[objname] == "up") obj[objname].style.display = "none";

obj[objname].style.height = endHeight[objname] + "px";

delete(moving[objname]);
delete(timerID[objname]);
delete(startTime[objname]);
delete(endHeight[objname]);
delete(obj[objname]);
delete(dir[objname]);

innerDiv.style.height = "130px";//NEW

return;
}