@font-face {
	font-family: 'Open Sans Light';
	font-weight: lighter;
	src:url(OpenSans-Light.ttf);
	src:url(OpenSans-Light.woff);
}
@font-face {
	font-family: 'Open Sans Light';
	font-weight: lighter;
	font-style:italic;
	src:url(OpenSans-LightItalic.ttf);
	src:url(OpenSans-LightItalic.woff);
}
<!--[if !IE]> -->
@font-face {
	font-family: 'Open Sans';
	font-weight: normal;
	font-style:normal;
	src:url(OpenSans-Regular.ttf);
	
}
<!-- <![endif]-->
@font-face {
	font-family: 'Open Sans';
	font-weight: normal;
	font-style:normal;
	src:url(OpenSans-Regular.woff);
	
}
@font-face {
	font-family: 'Open Sans';
	font-weight: 400;
	font-style:normal;
	src:url(OpenSans-Regular.ttf);
	src:url(OpenSans-Regular.woff);
}
@font-face {
	font-family: 'Open Sans';
	font-weight: normal;
	font-style:italic;
	src:url(OpenSans-Italic.ttf);
	src:url(OpenSans-Italic.woff);
}
@font-face {
	font-family: 'Open Sans Semibold';
	font-weight: 600;
	src:url(OpenSans-Semibold.ttf);
	src:url(OpenSans-Semibold.woff);
}
@font-face {
	font-family: 'Open Sans Semibold';
	font-weight: 600;
	font-style:italic;
	src:url(OpenSans-SemiboldItalic.ttf);
	src:url(OpenSans-SemiboldItalic.woff);
}
@font-face {
	font-family: 'Open Sans';
	font-weight: bold;
	src:url(OpenSans-Bold.ttf);
	src:url(OpenSans-Bold.woff);
}
@font-face {
	font-family: 'Open Sans';
	font-weight: bold;
	font-style:italic;
	src:url(OpenSans-BoldItalic.ttf);
	src:url(OpenSans-BoldItalic.woff);
}
@font-face {
	font-family: 'Open Sans Extrabold';
	font-weight: bolder;
	font-style:normal;
	src:url(OpenSans-ExtraBold.ttf);
	src:url(OpenSans-ExtraBold.woff);
}
@font-face {
	font-family: 'Open Sans Extrabold';
	font-weight: bolder;
	font-style:italic;
	src:url(OpenSans-ExtraBoldItalic.ttf);
	src:url(OpenSans-ExtraBoldItalic.woff);
}