echo '<div id="block'.$one->id.'" class="unblock" style = "display:block">
                   <a href="Javascript:void(0);" onclick="Javascript:send_command(\''.url::site('/handler?act=block&id='.$one->id).'\');" class="add_a">Заблокировать</a>
               </div>';

function send_command(url) {
		var destUrl = url;
		xmlhttp.open("GET", destUrl, true);
		xmlhttp.onreadystatechange = updatePage;
		xmlhttp.send(null);
	}

$("div").click(function(){
		if(this.id.substr( 0 , 5 ) == 'block')
			alert( 123 );
	});

$("div[id^='block']").click(function(){});

<div id="block35">...

var id = 'ablock123';

<form action = "<? echo url::site('/handler/add_img') ?>" method="post" name = "img_form" enctype="multipart/form-data">
Изображение:<input name="image" type = "file" />
<input type="hidden" name ="product_id" value = "<?echo $product->id?>" />
</form>
<div class="save">
 <a href="Javascript:void(0)" onClick="document.forms.img_form.submit();" class="save_a">Сохранить</a>
</div>

$(document).ready(function() { 
    var options = { target: '#img_list',success: process_response }; 
    $('#img_form').submit(function() { 
        $(this).ajaxSubmit(options); 
        return false; 
    });
}); 
  function process_response(responseText, statusText)
  {
  alert(responseText);
  }