Here is the one line needed in the webpage:

<img src="YourIPCamInfo&t=" width='' onload='setTimeout(function() {src = src.substring(0, (src.lastIndexOf("t=")+2))+(new Date()).getTime()}, 1000)' onerror='setTimeout(function() {src = src.substring(0, (src.lastIndexOf("t=")+2))+(new Date()).getTime()}, 5000)' alt='' />

Foscam MJPEG Camera Example:

<img src="http://DDNSorISPIPAddress:PortForCamera/snapshot.cgi?&user=admin&pwd=YourPassword&t=" onload='setTimeout(function() {src = src.substring(0, (src.lastIndexOf("t=")+2))+(new Date()).getTime()}, 1000)' onerror='setTimeout(function() {src = src.substring(0, (src.lastIndexOf("t=")+2))+(new Date()).getTime()}, 5000)' alt='' />

Foscam H.264 Camera Example:

<img src="http://DDNSorISPIPAddress:PortForCamera/CGIProxy.fcgi?cmd=snapPicture2&usr=admin&pwd=YourPassword&t=" onload='setTimeout(function() {src = src.substring(0, (src.lastIndexOf("t=")+2))+(new Date()).getTime()}, 1000)' onerror='setTimeout(function() {src = src.substring(0, (src.lastIndexOf("t=")+2))+(new Date()).getTime()}, 5000)' alt='' />

A working Example of this as well as more details can be Found here:

http://foscam.us/forum/a-how-to-embed-any-foscam-ip-camera-in-webpage-using-1-line-t9113.html#p43654