function getcss(cssfile){
	loadcss = document.createElement('link')
	loadcss.setAttribute("rel", "stylesheet")
	loadcss.setAttribute("type", "text/css")
	loadcss.setAttribute("href", cssfile)
	document.getElementsByTagName("head")[0].appendChild(loadcss)
}

if(screen.width <= '800') {
	getcss('scripts/small.css'); 
}else if(screen.width > '800' && screen.width <= '1024'){
 	getcss('scripts/big.css');
}else if(screen.width > '1024' && screen.width < '1600'){
 	getcss('scripts/huge.css');
}else {
 	getcss('scripts/huge.css');
}