function showDialog(word){ 
 src="explanation_community.php?word="+word;
 var explanation=window.open(src,"explanation","status=yes,scrollbars=yes,location=no,menubar=no,resizable=yes, toolbar=no, width=600, height=500");
 win.focus();
 return false;
}

function getVoc(){
 el=document.getElementById('wrd');
 showDialog(el.value);
}