window.onload = resize;
window.onresize = resize;

function resize(){
	if(typeof(window.innerHeight) == 'number')
	{
		b = window.innerHeight;
	}
    else if( document.documentElement && document.documentElement.clientHeight ) {
    	b = document.documentElement.clientHeight;
    }
  	else if( document.body && document.body.clientHeight ) {
    	b = document.body.clientHeight;
    }
    document.getElementById("content").style.minHeight = (b-300) + "px";

}