var ns4 = (document.layers)?true:false 
var ie4 = (document.all)?true:false 
if(ie4){ 
    document.write("<link rel='stylesheet' href='css/estilos_ie.css'>") 
}else{ 
    document.write("<link rel='stylesheet' href='css/estilos_ns.css'>") 
} 
function overTD(td,color){td.bgColor=color;} 
function outTD(td,color){td.style.cursor='default';td.bgColor=color;} 
function clickTD(td){td.children.tags('A')[0].click();}