window.onload = function(){
	var url=[];
	url[0] = 'h_greeting01_01.png';
	url[1] = 'h_greeting01_02.png';
	url[2] = 'h_greeting01_03.png';
	url[3] = 'h_greeting01_04.png';
	url[4] = 'h_greeting01_05.png';
	url[5] = 'h_greeting01_06.png';
	url[6] = 'h_greeting01_07.png';
	url[7] = 'h_greeting01_08.png';
	var n = Math.floor(Math.random() * url.length);
	var elm = document.getElementById('proGreeting');
	elm.style.backgroundImage = 'url(images/top/' + url[n] + ')';
	
	var url2=[];
	url2[0] = 'h_greeting02_01.png';
	url2[1] = 'h_greeting02_02.png';
	url2[2] = 'h_greeting02_03.png';
	var n2 = Math.floor(Math.random() * url2.length);
	var elm2 = document.getElementById('serviceGreeting');
	elm2.style.backgroundImage = 'url(images/top/' + url2[n2] + ')';
	
	var url3=[];
	url3[0] = 'h_greeting03_01.png';
	url3[1] = 'h_greeting03_02.png';
	url3[2] = 'h_greeting03_03.png';
	var n3 = Math.floor(Math.random() * url3.length);
	var elm3 = document.getElementById('mealGreeting');
	elm3.style.backgroundImage = 'url(images/top/' + url3[n3] + ')';
}