function changecolor(obj)
{
	e = event.srcElement;
	if(e.checked==true)
	{
		document.getElementById(obj).style.background = "#EFEFEF";
	}
	else{
		document.getElementById(obj).style.background = "#ffffff";
	}
}

function selectall(obj){
	var a=event.srcElement;
	if (a.checked==true){
		for(var i = 0;i<obj.elements.length;i++)
		{
			if(obj.elements[i].type == "checkbox"){
				obj.elements[i].checked = true;
			}
		}
	}else{
		for(var i = 0;i<obj.elements.length;i++)
		{
			if(obj.elements[i].type == "checkbox"){
				obj.elements[i].checked = false;
			}
		}
	}
}