function font(size){
$("body").css("font-size",size);

switch(size){
	case "75%": 
		document.small.src='common/images/btn_fontSize_01_on.gif';
		document.medium.src='common/images/btn_fontSize_02.gif';
		document.large.src='common/images/btn_fontSize_03.gif';
		break;
	case "88%": 
		document.small.src='common/images/btn_fontSize_01.gif';
		document.medium.src='common/images/btn_fontSize_02_on.gif';
		document.large.src='common/images/btn_fontSize_03.gif';
		break;
	case "100%": 
		document.small.src='common/images/btn_fontSize_01.gif';
		document.medium.src='common/images/btn_fontSize_02.gif';
		document.large.src='common/images/btn_fontSize_03_on.gif';
		break;
	}
}