Background script w/ name


Hello, can you help with my code?
I want it to display the name of the background at top right corner but I don’t know how I do it.
Can you help me? This script gets enabled when you refresh the site. What it does is that it changes the current background to another random background. But I’m stuck right now because I don’t know how I can display a text saying what name of the background has. I thought maybe you could help. The images will repeat too and I don’t want it to do it, I want it to show it on full size. The html script:

	function changeImg(imgNumber)	{
		var myImages = ["watercolor-backgrounds-10.jpg", "watercolor-backgrounds-11.jpg", "watercolor-backgrounds-16.jpg"]; 
		var imgShown =;
		var newImgNumber =Math.floor(Math.random()*myImages.length); = 'url('+myImages[newImgNumber]+')';