function ddlchange(obj)
{
    window.open(obj.options[obj.selectedIndex].value);obj.options[0].selected=true;
}

function ShowHideLayers(id,thiscss,v){
	var mid;
	for(i=1;i<4;i++){
		mid = "m"+i;		
		document.getElementById(mid).style.display='none';
	}
	v=(v=='show')?'block':(v=='hide')?'none':v; 
	document.getElementById(id+"_a").className=thiscss;
	document.getElementById(id).style.display=v;
	
}