function overButton(button_num) {
	if (button_num==1) { document.getElementById('mbutton'+button_num).src="image/ERP_but_solution_b.gif";	}
	if (button_num==2) { document.getElementById('mbutton'+button_num).src="image/ERP_but_trad_b.gif";	}
	if (button_num==3) { document.getElementById('mbutton'+button_num).src="image/ERP_but_devep_b.gif";	}
	if (button_num==4) { document.getElementById('mbutton'+button_num).src="image/ERP_sbut_operation_b.gif";	}
	if (button_num==5) { document.getElementById('mbutton'+button_num).src="image/ERP_sbut_advantage_b.gif";	}
	if (button_num==6) { document.getElementById('mbutton'+button_num).src="image/ERP_but_service_b.gif";	}
	if (button_num==7) { document.getElementById('mbutton'+button_num).src="image/ERP_but_casestudy_b.gif";}
	if (button_num==8) { document.getElementById('mbutton'+button_num).src="image/ERP_but_news_b.gif";}
	if (button_num==9) { document.getElementById('mbutton'+button_num).src="image/ERP_but_partner_b.gif";}
	if (button_num==10) { document.getElementById('mbutton'+button_num).src="image/ERP_but_aboutus_b.gif";}
	if (button_num==11) { document.getElementById('mbutton'+button_num).src="image/ERP_but_contactus_b.gif";}
	if (button_num==12) { document.getElementById('mbutton'+button_num).src="image/ERP_but_enquiry_b.gif";}
	if (button_num==13) { document.getElementById('mbutton'+button_num).src="image/ERP_but_career_b.gif";}
}

function outButton(button_num) {
	if (button_num==1) { document.getElementById('mbutton'+button_num).src="image/ERP_but_solution_a.gif";	}
	if (button_num==2) { document.getElementById('mbutton'+button_num).src="image/ERP_but_trad_a.gif";	}
	if (button_num==3) { document.getElementById('mbutton'+button_num).src="image/ERP_but_devep_a.gif";	}
	if (button_num==4) { document.getElementById('mbutton'+button_num).src="image/ERP_sbut_operation_a.gif";	}
	if (button_num==5) { document.getElementById('mbutton'+button_num).src="image/ERP_sbut_advantage_a.gif";	}
	if (button_num==6) { document.getElementById('mbutton'+button_num).src="image/ERP_but_service_a.gif";	}					
	if (button_num==7) { document.getElementById('mbutton'+button_num).src="image/ERP_but_casestudy_a.gif";}															
	if (button_num==8) { document.getElementById('mbutton'+button_num).src="image/ERP_but_news_a.gif";}															
	if (button_num==9) { document.getElementById('mbutton'+button_num).src="image/ERP_but_partner_a.gif";}	
	if (button_num==10) { document.getElementById('mbutton'+button_num).src="image/ERP_but_aboutus_a.gif";}
	if (button_num==11) { document.getElementById('mbutton'+button_num).src="image/ERP_but_contactus_a.gif";	}
	if (button_num==12) { document.getElementById('mbutton'+button_num).src="image/ERP_but_enquiry_a.gif";	}
	if (button_num==13) { document.getElementById('mbutton'+button_num).src="image/ERP_but_career_a.gif";	}
}