<script type="text/javascript">   
    $('#mchatMsgF').keyup(function(){   
    var url = ["http://", "https://", "www", ".ru", ".su", ".com", ".lv", "www", ".net"];   
    var field = $(this).val();   
    for (i=0; i<url.length; i++){   
    if(field.toLowerCase().indexOf(url[i],'ig')!=-1)   
    if(field.search(document.location.host)==-1) {   
    _uWnd.alert('Linku ievietošana čatā ir aizliekta!','',{w:180,h:38,tm:3000});   
    $(this).val(field.replace(url[i],''));   
    }   
    }   
    });   
    </script>