var x;
if(self.innerHeight) // all except Explorer
{
	x = self.innerWidth;
}
else if (document.documentElement && document.documentElement.clientHeight) //Explorer 6 Strict Mode
{
	x = document.documentElement.clientWidth;
}
else if (document.body) // other Explorers
{
	x = document.body.clientWidth;
}

if (x <= 1030){
	document.write('<link rel="stylesheet" type="text/css" href="css/width.css" />\n');
}

function over(obj){
	var a =obj.src
		var b = a.split('/').pop().split('_');  
		
		if(b[0]=='a')
			return;
		
		if(b[0]=='n')
			b[0]='o';
		else
			b[0]='n';
				
		var c = b.join('_');
		obj.src ='img_nav/'+ c;
}