var isIMG = document.images;
var bon;
var boff;

if (isIMG) {
bon = new Image(); 
boff = new Image();   
}

function b(bname) {
	if (isIMG) {
    	document[bname].src = (document[bname].src.indexOf('/images/images_content_chi_clf/arrow_dark.gif') != -1) ? '/images/images_content_chi_clf/arrow_light.gif' : '/images/images_content_chi_clf/arrow_dark.gif';
        }
}

function b2(b2name) {
	if (isIMG) {
    	document[b2name].src = (document[b2name].src.indexOf('/images/images_content_chi_clf/arrow_small_dark.gif') != -1) ? '/images/images_content_chi_clf/arrow_small_light.gif' : '/images/images_content_chi_clf/arrow_small_dark.gif';
        }
}

function GotoTop(gotop1) {
	if (isIMG) {
		document[gotop1].src = (document[gotop1].src.indexOf('/images/images_content_chi_clf/gototop_arrow_gray_over.gif') != -1) ? '/images/images_content_chi_clf/gototop_arrow_gray_out.gif' : '/images/images_content_chi_clf/gototop_arrow_gray_over.gif';
    }
}

function GotoTop2(gotop2) {
	if (isIMG) {
		document[gotop2].src = (document[gotop2].src.indexOf('/images/images_content_chi_clf/gototop_arrow_gray_over.gif') != -1) ? '/images/images_content_chi_clf/gototop_arrow_gray_out.gif' : '/images/images_content_chi_clf/gototop_arrow_gray_over.gif';
    }
}

function GotoTop_bottom(bottom) {
	if (isIMG) {
		document[bottom].src = (document[bottom].src.indexOf('/images/images_content_chi_clf/gototop_arrow_gray_over.gif') != -1) ? '/images/images_content_chi_clf/gototop_arrow_white.gif' : '/images/images_content_chi_clf/gototop_arrow_gray_over.gif';
    }
}

function SpeechBubble(bubble) {
	if (isIMG) {
		document[bubble].src = (document[bubble].src.indexOf('/images/images_content_chi_clf/speech_over.gif') != -1) ? '/images/images_content_chi_clf/speech_out.gif' : '/images/images_content_chi_clf/speech_over.gif';
    }
}

function LFolder(mapx) {
	if (isIMG) {
		document[mapx].src = (document[mapx].src.indexOf('/images/images_content_chi_clf/Lfolder_over.gif') != -1) ? '/images/images_content_chi_clf/Lfolder_out.gif' : '/images/images_content_chi_clf/Lfolder_over.gif';
    }
}

function BlueFolder(map2) {
	if (isIMG) {
		document[map2].src = (document[map2].src.indexOf('/images/images_content_chi_clf/bluefolder_over.gif') != -1) ? '/images/images_content_chi_clf/bluefolder_out.gif' : '/images/images_content_chi_clf/bluefolder_over.gif';
    }
}

function BlueSquare(map3) {
	if (isIMG) {
		document[map3].src = (document[map3].src.indexOf('/images/images_content_chi_clf/bluesquare_over.gif') != -1) ? '/images/images_content_chi_clf/bluesquare_out.gif' : '/images/images_content_chi_clf/bluesquare_over.gif';
    }
}

function GrayFolder(map4) {
	if (isIMG) {
		document[map4].src = (document[map4].src.indexOf('/images/images_content_chi_clf/grayfolder_over.gif') != -1) ? '/images/images_content_chi_clf/grayfolder_out.gif' : '/images/images_content_chi_clf/grayfolder_over.gif';
    }
}

function GraySquare(map5) {
	if (isIMG) {
		document[map5].src = (document[map5].src.indexOf('/images/images_content_chi_clf/graysquare_over.gif') != -1) ? '/images/images_content_chi_clf/graysquare_out.gif' : '/images/images_content_chi_clf/graysquare_over.gif';
    }
}


function HomepageEng(engover) {
	if (isIMG) {
		document[engover].src = (document[engover].src.indexOf('/images/images_home/cmouseover_eng.gif') != -1) ? '/images/images_home/eng_content_2.gif' : '/images/images_home/cmouseover_eng.gif';
    }
}

function HomepageChi(chiover) {
	if (isIMG) {
		document[chiover].src = (document[chiover].src.indexOf('/images/images_home/emouseover_chi.gif') != -1) ? '/images/images_home/chinese_content.gif' : '/images/images_home/emouseover_chi.gif';
    }
}

function AboutEng(engabout) {
	if (isIMG) {
		document[engabout].src = (document[engabout].src.indexOf('/images/images_home/cabout_mouseover_e.gif') != -1) ? '/images/images_home/about_e.gif' : '/images/images_home/cabout_mouseover_e.gif';
    }
}

function AboutChi(chiabout) {
	if (isIMG) {
		document[chiabout].src = (document[chiabout].src.indexOf('/images/images_home/eabout_mouseover_c.gif') != -1) ? '/images/images_home/about_c.gif' : '/images/images_home/eabout_mouseover_c.gif';
    }
}

function CopyEng(engcopy) {
	if (isIMG) {
		document[engcopy].src = (document[engcopy].src.indexOf('/images/images_home/ccopyright_mouseover_e.gif') != -1) ? '/images/images_home/copyright_e.gif' : '/images/images_home/ccopyright_mouseover_e.gif';
    }
}

function CopyChi(chicopy) {
	if (isIMG) {
		document[chicopy].src = (document[chicopy].src.indexOf('/images/images_home/ecopyright_mouseover_c.gif') != -1) ? '/images/images_home/copyright_c.gif' : '/images/images_home/ecopyright_mouseover_c.gif';
    }
}