//Si el Explorador es...

//Firefox 2
if (navigator.userAgent.toLowerCase().indexOf('firefox/2') > -1)
document.write('<style type="text/css"> \
a, span, img {display:-moz-inline-box;} \
</style>');

//Internet Explorer 6
if (navigator.userAgent.toLowerCase().indexOf('ie 6') > -1)
document.write('<style type="text/css"> \
#container_fecha {float:left; height:30px; margin-top:15px !important;} \
</style>');

//Internet Explorer 7
if (navigator.userAgent.toLowerCase().indexOf('ie 7') > -1)
document.write('<style type="text/css"> \
#container_fecha {float:left; height:30px; margin-top:15px !important;} \
</style>');

//Internet Explorer 8
if (navigator.userAgent.toLowerCase().indexOf('ie 8') > -1)
document.write('<style type="text/css"> \
</style>');

//Safari
if (navigator.userAgent.toLowerCase().indexOf('safari') > -1)
document.write('<style type="text/css"> \
textarea {resize:none;} \
</style>');

//Google Chrome
if (navigator.userAgent.toLowerCase().indexOf('chrome') > -1)
document.write('<style type="text/css"> \
textarea {resize:none;} \
</style>');

//Opera
if (navigator.userAgent.toLowerCase().indexOf('opera') > -1)
document.write('<style type="text/css"> \
\
</style>');