onload=function(){

	var rd = Math.random();

	if( rd <= 0.07 ){
		photo_01();
	}
	else if( rd <= 0.14 ){
		photo_02();
	}
	else if( rd <= 0.21 ){
		photo_03();
	}
	else if( rd <= 0.28 ){
		photo_04();
	}
	else if( rd <= 0.35 ){
		photo_05();
	}
	else if( rd <= 0.42 ){
		photo_06();
	}
	else if( rd <= 0.49 ){
		photo_07();
	}
	else if( rd <= 0.56 ){
		photo_08();
	}
	else if( rd <= 0.63 ){
		photo_09();
	}
	else if( rd <= 0.70 ){
		photo_10();
	}
	else if( rd <= 0.77 ){
		photo_11();
	}
	else if( rd <= 0.84 ){
		photo_12();
	}
	else if( rd <= 1.00 ){
		photo_13();
	}
}


/* photo_01 (isomura) */
function photo_01(){
	var obj = document.getElementById("ci_section");
	obj.style.backgroundImage ="url(images/photo/photo_isomura.jpg)";
}
/* photo_02 (fujii) */
function photo_02(){
	var obj = document.getElementById("ci_section");
	obj.style.backgroundImage ="url(images/photo/photo_fujii.jpg)";
}
/* photo_03 (inaba) */
function photo_03(){
	var obj = document.getElementById("ci_section");
	obj.style.backgroundImage ="url(images/photo/photo_inaba.jpg)";
}
/* photo_04 (ito) */
function photo_04(){
	var obj = document.getElementById("ci_section");
	obj.style.backgroundImage ="url(images/photo/photo_ito.jpg)";
}
/* photo_05 (iwata) */
function photo_05(){
	var obj = document.getElementById("ci_section");
	obj.style.backgroundImage ="url(images/photo/photo_iwata.jpg)";
}
/* photo_06 (kishi) */
function photo_06(){
	var obj = document.getElementById("ci_section");
	obj.style.backgroundImage ="url(images/photo/photo_kishi.jpg)";
}
/* photo_07 (kizawa) */
function photo_07(){
	var obj = document.getElementById("ci_section");
	obj.style.backgroundImage ="url(images/photo/photo_kizawa.jpg)";
}
/* photo_08 (koutatsu) */
function photo_08(){
	var obj = document.getElementById("ci_section");
	obj.style.backgroundImage ="url(images/photo/photo_koutatsu.jpg)";
}
/* photo_09 (matsuno) */
function photo_09(){
	var obj = document.getElementById("ci_section");
	obj.style.backgroundImage ="url(images/photo/photo_matsuno.jpg)";
}
/* photo_10 (nanbu) */
function photo_10(){
	var obj = document.getElementById("ci_section");
	obj.style.backgroundImage ="url(images/photo/photo_nanbu.jpg)";
}
/* photo_11 (naoki) */
function photo_11(){
	var obj = document.getElementById("ci_section");
	obj.style.backgroundImage ="url(images/photo/photo_naoki.jpg)";
}
/* photo_12 (ohashi) */
function photo_12(){
	var obj = document.getElementById("ci_section");
	obj.style.backgroundImage ="url(images/photo/photo_ohashi.jpg)";
}
/* photo_13 (shimomura) */
function photo_13(){
	var obj = document.getElementById("ci_section");
	obj.style.backgroundImage ="url(images/photo/photo_shimomura.jpg)";
}