function checkIfIE(){
	var name = 'MSIE';
	var agent = navigator.userAgent.toLowerCase();  
	if (agent.indexOf(name.toLowerCase())>-1) {  
		var img1 = document.getElementById("img_1");
		var img2 = document.getElementById("img_2");
		
		img1.src = "images/flash.jpg";
		img2.src = "images/html.jpg";
	}
}

checkIfIE();