var uagent = navigator.userAgent.toLowerCase();

var test_brow = /chrome/.test( uagent );

//Test for Google Chrome
if ( test_brow )
{
	$(document).ready(function(){
        	$("#world_image").css("margin-top","13px");
        });
}
else
{
	var test_brow = /safari/.test( uagent );
	var test_version = /version\/4.0/.test( uagent );
	test_version = uagent.match(/\d+/);
	//alert(parseInt(test_version[0], 10));
	//Test for Safari 4
	if ( test_brow && (test_version >= 4) )
	{
		$(document).ready(function(){
			$("#world_image").css("margin-top","13px");
		});
	}
}