/* *********************************************************************
	トップページフォト変更用スクリプト（topImageChange.js)
************************************************************************ */

/* function: galleryChange */
function galleryChange(img1, img2, title1, title2, url1, url2){
	mn=1;
	mx=2;
	
	r=Math.round(Math.random()*(mx-mn))+mn;

	if(r==1){
		if(img1){
			document.getElementById("galleryImg").src=img1;
			document.getElementById("galleryImg").alt=title1;
			document.getElementById("galleryLink").href=url1;
			document.getElementById("galleryTitle").innerHTML='<a id="galleryLink" href="'+url1+'">'+title1+'</a>';
			return true;
		}
	}else if(r==2){
		if(img2){
			document.getElementById("galleryImg").src=img2;
			document.getElementById("galleryImg").alt=title2;
			document.getElementById("galleryLink").href=url2;
			document.getElementById("galleryTitle").innerHTML='<a id="galleryLink" href="'+url2+'">'+title2+'</a>';
			return true;
		}
	}
}

/* function: mainImageChange */
function mainImageChange(img1, img2, img3, img4, img5, defaultImg){
	mn=1;
	mx=1;
	
	if(img1){
		mx=1;
	}
	if(img2){
		mx=2;
	}
	if(img3){
		mx=3;
	}
	if(img4){
		mx=4;
	}
	if(img5){
		mx=5;
	}
	
	r=Math.round(Math.random()*(mx-mn))+mn;

	if(r==1){
		if(img1){
			document.getElementById('mainImg').style.backgroundImage = "url("+img1+")";
		}else{
			document.getElementById('mainImg').style.backgroundImage = "url("+defaultImg+")";
		}
	}else if(r==2){
		if(img2){
			document.getElementById('mainImg').style.backgroundImage = "url("+img2+")";
		}else{
			document.getElementById('mainImg').style.backgroundImage = "url("+defaultImg+")";
		}
	}else if(r==3){
		if(img3){
			document.getElementById('mainImg').style.backgroundImage = "url("+img3+")";
		}else{
			document.getElementById('mainImg').style.backgroundImage = "url("+defaultImg+")";
		}
	}else if(r==4){
		if(img4){
			document.getElementById('mainImg').style.backgroundImage = "url("+img4+")";
		}else{
			document.getElementById('mainImg').style.backgroundImage = "url("+defaultImg+")";
		}
	}else if(r==5){
		if(img5){
			document.getElementById('mainImg').style.backgroundImage = "url("+img5+")";
		}else{
			document.getElementById('mainImg').style.backgroundImage = "url("+defaultImg+")";
		}
	}
}