function opt_switcher(elemNum, mItemCounter) {
	var el01 = '';
	
	for (var i=1; i<=mItemCounter; i++) {
						
		if (document.getElementById('dd0'+i)) {
		
			document.getElementById('dd0'+i).style.display = (i!= elemNum)?'none':'block'
		}					

		el01 = document.getElementById('ldl0'+i);
			if (el01) {
				if (i!=elemNum) {
					el01.className=el01.className.replace(new RegExp("_act\\b"), "");						
				}  else {							
					if (el01.className.indexOf("_act")<0) {el01.className+='_act'}
				}
			}			
						
	}				
}


function addLoadEvent(func) {	// get from Simon Willison’s Weblog
	var oldonload = window.onload;
	if (typeof window.onload != 'function'){
    	window.onload = func;
	} else {
		window.onload = function(){
		oldonload();
		func();
		}
	}
}

var chel_num = 4; 

function opt_checker() {
	opt_switcher(0, 4);
	
	for (var j=1; j<=chel_num; j++) {
		if ((document.getElementById('inp1'+j))&&(document.getElementById('inp1'+j).checked)) {
			opt_switcher(j, 4);
		}					
	}
	
}

addLoadEvent(opt_checker)