if ((screen.width>=1024) && (screen.height>=768)) {
	document.write('<IMG SRC="main/common/logo-v4.jpg" alt="logo.jpg">');
}

if ((screen.width>=800) && (screen.width<1024) && (screen.height>=600))
{
	document.write('<IMG SRC="main/common/logo-v4.jpg" alt="logo.jpg">');
}

if ((screen.width>=0) && (screen.width<800) && (screen.height>=0)) {
	document.write('<IMG SRC="main/common/logo-v4.jpg" alt="logo.jpg">');
}