function MM_openBrWindow(theURL,winName,features) { 
window.open(theURL,winName,features);
}

function guan(){
if (document.layers){
layers['Layer2'].visibility='hidden';
layers['m1'].display="";
layers['m2'].display="none";
}
else{
Layer2.style.visibility='hidden';
m1.style.display="";
m2.style.display="none";
}
}

function show(){
if (document.layers){
layers['Layer2'].visibility='visible';
layers['m1'].display="none";
layers['m2'].display="";
}
else{
Layer2.style.visibility='visible';
m1.style.display="none";
m2.style.display="";
}
}