window.onload = choosePic;

var myPix = new Array("../images/content_image1.png","../images/content_image2.png","../images/content_image3.png","../images/content_image4.png","../images/content_image5.png","../images/content_image6.png","../images/content_image7.png");

function choosePic() {
	randomNum = Math.floor((Math.random() * myPix.length));
	document.getElementById("content_image").src = myPix[randomNum];
}