I'm trying to create a function to display either a theme option or custom images based on user input.

So basically, it's a custom meta box. The user selects either a display header image OR they can upload one they want to use.

I've created a custom function to call later on the single page template. This is what I have so far.

    //El display image
    function el_display(){
    	global $post;
    	$eldisplay = get_post_meta($post->ID, '_cmb_el_theme', true);
    	$elcustomdisplay = get_post_meta($post->ID, '_cmb_custom_image', true);
    		
    		if(isset($eldisplay)){
    			echo '<img src="' . $eldisplay . '" />';
    				}elseif(isset($elcustomdisplay)){
    				echo '<img src="' . $elcustomdisplay . '" />';
    			}else{
    				echo '<img src="' . EL_IMG . 'mobile-development.jpg' . '" />';
    			}
    }

When I call the function later (using  el_display(); ), there is no display image showing. I'm a little stuck and have been trying to fix this for hours.

Any help would be much appreciated, thanks!


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**UPDATE**
Ok, thanks to all for helping me out and pointing me in the right direction. I do have some code clean up to do and a possible all out change in code but I'll use this for now.

I got it to work with the following code.

    //El display image
    function el_display(){
    	global $post;
    	$eldisplay = get_post_meta($post->ID, '_cmb_el_theme', true);
    	$elcustomdisplay = get_post_meta($post->ID, '_cmb_custom_image', true);
    		
    		if(!empty($eldisplay)){
    			echo '<img src="' . $eldisplay . '" />';
    				}elseif(!empty($elcustomdisplay) && isset($elcustomdisplay)){
    				echo '<img src="' . $elcustomdisplay . '" />';
    			}else{
    				echo '<img src="' . EL_IMG . 'mobile-development.jpg' . '" />';
    			}
    }

Thanks again!