onload=function(){

	var rd = Math.random();

	if( rd <= 0.08 ){
		photo_01();
	}
	else if( rd <= 0.16 ){
		photo_02();
	}
	else if( rd <= 0.24 ){
		photo_03();
	}
	else if( rd <= 0.32 ){
		photo_04();
	}
	else if( rd <= 0.40 ){
		photo_05();
	}
	else if( rd <= 0.48 ){
		photo_02();
	}
	else if( rd <= 0.56 ){
		photo_07();
	}
	else if( rd <= 0.64 ){
		photo_08();
	}
	else if( rd <= 0.72 ){
		photo_09();
	}
	else if( rd <= 0.80 ){
		photo_10();
	}
	else if( rd <= 0.88 ){
		photo_11();
	}
	else if( rd <= 0.96 ){
		photo_12();
	}
	else{
		photo_13();
	}
}


/* photo_01 (yamaguchi) */
function photo_01(){
	var obj = document.getElementById("ci_section");
	obj.style.backgroundImage ="url(images/photo/photo_yamaguchi.jpg)";
}
/* photo_02 (isomura) */
function photo_02(){
	var obj = document.getElementById("ci_section");
	obj.style.backgroundImage ="url(images/photo/photo_isomura.jpg)";
}
/* photo_03 (hirabayashi) */
function photo_03(){
	var obj = document.getElementById("ci_section");
	obj.style.backgroundImage ="url(images/photo/photo_hirabayashi.jpg)";
}
/* photo_04 (takagi) */
function photo_04(){
	var obj = document.getElementById("ci_section");
	obj.style.backgroundImage ="url(images/photo/photo_takagi.jpg)";
}
/* photo_05 (hideyuki) */
function photo_05(){
	var obj = document.getElementById("ci_section");
	obj.style.backgroundImage ="url(images/photo/photo_hideyuki.jpg)";
}
/* photo_06 (fumiko) */
function photo_06(){
	var obj = document.getElementById("ci_section");
	obj.style.backgroundImage ="url(images/photo/photo_asano.jpg)";
}
/* photo_07 (shigemori) */
function photo_07(){
	var obj = document.getElementById("ci_section");
	obj.style.backgroundImage ="url(images/photo/photo_shigemori.jpg)";
}
/* photo_08 (matsui) */
function photo_08(){
	var obj = document.getElementById("ci_section");
	obj.style.backgroundImage ="url(images/photo/photo_matsui.jpg)";
}
/* photo_09 (iwata) */
function photo_09(){
	var obj = document.getElementById("ci_section");
	obj.style.backgroundImage ="url(images/photo/photo_iwata.jpg)";
}
/* photo_10 (tokushiro) */
function photo_10(){
	var obj = document.getElementById("ci_section");
	obj.style.backgroundImage ="url(images/photo/photo_tokushiro.jpg)";
}
/* photo_11 (asano) */
function photo_11(){
	var obj = document.getElementById("ci_section");
	obj.style.backgroundImage ="url(images/photo/photo_asano.jpg)";
}
/* photo_12 (keiko) */
function photo_12(){
	var obj = document.getElementById("ci_section");
	obj.style.backgroundImage ="url(images/photo/photo_fujita.jpg)";
}
/* photo_13 (ito) */
function photo_13(){
	var obj = document.getElementById("ci_section");
	obj.style.backgroundImage ="url(images/photo/photo_ito.jpg)";
}