function iFrameHeight() {
       var h = 0;
       var Opera = window.opera ? true : false;
       if (Opera) {//Opera
           h = document.getElementById('blockrandom').contentDocument.getElementById('inHeight').offsetHeight;
           document.getElementById('blockrandom').setAttribute("height",h);
	   }else if( document.all ) {//IE
           h = document.frames('blockrandom').document.body.scrollHeight;
           document.all.blockrandom.style.height = h + 'px';
       }else if(navigator.userAgent.indexOf("Firefox") != -1) {//Firefox       
	       h = document.getElementById('blockrandom').contentDocument.getElementById('inHeight').offsetHeight;
		   document.getElementById('blockrandom').style.height = h + 'px'; 
       }else{//‘¼       
	       h = document.getElementById('blockrandom').contentDocument.height;
		   document.getElementById('blockrandom').style.height = h + 'px'; 
	   }
}