checked yardım.

<script type="text/javascript" src="http://www.listedinle.com/_js/jq.js"></script>

<div id="inputlar">
<input name="modtype" id="i1" type="checkbox" value="value1" />value1
<input type="checkbox" name="modtype" value="value2" />value2
</div>

<div class="row" id="div1" style="display:none">Show Div 1</div>
<div class="row" id="div2" style="display:none">Show Div 2</div>


<script type="text/javascript">
$("#inputlar").find("input:first-child").attr('checked','checked');
var secili = $("#inputlar").find("input:first-child").attr("checked");


if(secili='checked'){
	$("#div1").show();
}


</script>

<script type="text/javascript" src="http://www.listedinle.com/_js/jq.js"></script> 


<div id="inputlar"> 
<input name="modtype"  rel="1" type="radio" value="value1" />buton 1 
<input type="radio" rel="2" name="modtype" value="value2" />buton 2 
<input type="radio" rel="3" name="modtype" value="value2" />buton 3 
<input type="radio" rel="4" name="modtype" value="value2" />buton 4 
</div> 

<div class="row" id="div1" style="display:block">input 1 e ait divin içeriği</div> 
<div class="row" id="div2" style="display:none">input 2 ye ait divin içeriği</div> 
<div class="row" id="div3" style="display:none">input 3 ye ait divin içeriği</div> 
<div class="row" id="div4" style="display:none">input 4 ye ait divin içeriği</div> 


<script type="text/javascript"> 
$("#inputlar").find("input:first-child").attr('checked','checked');



$("#inputlar").find("input").change(function(){
	var divno = $(this).attr("rel");
	
	if(this.checked){
	$(".row").hide();
	$("#div"+divno).show();
	} else {
	$(".row").hide();
	$("#div"+divno).show();
	}

}); 




</script>