var added=0;
var img=new Image();
img.src="delete.png";
function addname()
{
document.getElementById('adding'+added).innerHTML+='<span id="stuname'+(added+2)+'">Student&rsquo;s Name: <input id="'+(added+2)+'name" name="studentname'+(added+2)+'" class="pt" /><img src="delete.png" id="delete" onclick="deletename('+(added+2)+');" /><br /></span><span id="adding'+(added+1)+'"></span>';
document.getElementById('req').value+=',studentname'+(added+2);
added++;
}

function deletename(a)
{
var rx=new RegExp("\\,studentname"+a,"g");
document.getElementById("stuname"+a).innerHTML="";
document.getElementById('req').value=(document.getElementById('req').value+"").replace(rx,"")
}

function checkstudentnames()
{
var sns=(document.getElementById('req').value+"").split(/,/);
	for (sn in sns)
	{
		if (!Boolean(document.getElementById(sns[sn].replace(/studentname/,"")+"name")))
		{
			document.getElementById('req').value=(document.getElementById('req').value+"").replace(new RegExp("\\,"+sns[sn]),"");
		}
	}
}