var clickmessage="Right click disabled on images!"

function disableclick(e) {
if (document.all) {
	if (event.button==2||event.button==3) {
		if (event.srcElement.tagName=="IMG"){
			alert(clickmessage);
			return false;
		}
	}
}
else if (document.layers) {
	if (e.which == 3) {
		alert(clickmessage);
		return false;
	}
}
	else if (document.getElementById){
		if (e.which==3&&e.target.tagName=="IMG"){
			alert(clickmessage);
			return false;
		}
	}
}

function associateimages(){
	for(i=0;i<document.images.length;i++) document.images[i].onmousedown=disableclick;
}

if (document.all) document.onmousedown=disableclick;
else if (document.getElementById) document.onmouseup=disableclick;
else if (document.layers) associateimages();