<a href="#" onclick="del(<?=htmlspecialchars($row['uhid'])?>);return false;" class="btn">Del</a>
<script type="text/javascript">
	function del(elem){
		var id = elem;
		var request = new XMLHttpRequest();
		request.open('GET', 'tasks.php?uhid='+id, true);
		request.onreadystatechange = function() {
	  	if (this.readyState === 4) {
	    	if (this.status >= 200 && this.status < 400) {
	    		if(this.ResponseText == '1'){
	    			console.log('deleted');
	    		}else{
	    			console.log('error');
	    		}
	    	} else {
	    		console.log('could connect');
	    	}
	  	}
		};
		request.send();
		request = null;
	}
</script>