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ref: http://jsfiddle.net/vbrHA/
/*
- image exists in the database or will be uploaded in this form
- if the row->event_image  exists echo the img src of that image

*/



<input type='button' id='remove' value='remove' class='hide'/>
<input type="file" id="filelogo" name="file" style="height:50px !important;">
 
<?php 			
	if($event_image) { 
		echo '<img id="blah"  src="http://'.SITEURL.'organizer/upload/'. $event_image.'"height="250"  />';
	
	} 

<script>
// can't use this because there are already existing images in the database	
//$('#blah').hide();
//$('#remove').hide();
	
function readURL(input) {
    if (input.files && input.files[0]) {
        var reader = new FileReader();
        
        reader.onload = function (e) {
            $('#blah').attr('src', e.target.result);
        }
        
        reader.readAsDataURL(input.files[0]);
    }
}	

$("#filelogo").change(function() {
    if( $('#filelogo').val()!=""){
        
        $('#remove').show();
        $('#blah').show('slow');
  }
    else
    	{ $('#remove').hide();$('#blah').hide('slow');}
    readURL(this);
});

  
$('#remove').click(function() {
        $('#filelogo').val('');
        $(this).hide();
        $('#blah').hide('slow');
 $('#blah').attr('src','http://upload.wikimedia.org/wikipedia/commons/thumb/4/40/No_pub.svg/150px-No_pub.svg.png');
});
	
</script>