codice:
<iframe class="Composition" WIDTH="95%" id="Composition" height="190" src="boh.php" onload="b(this)">
    </iframe>  



<script>
function b(iframe){
if(iframe['contentDocument']){iframe['contentDocument'].onclick=c;}
else{iframe.onfocus=c;};
}


function c(){
alert('ciao');
}
</script>