// onload event coupler
function addLoadEvent(func) {
  var oldonload = window.onload;
  if (typeof window.onload != 'function') { 
    window.onload = func;
  } else {
    window.onload = function() {
      oldonload();
      func();
    }
  }
}

addLoadEvent(function() {
  initRollover();
});




/* checks for Safari */
function chckBrwsr(){
	var agentStr = navigator.userAgent.toLowerCase();
	if( agentStr.indexOf('safari') != -1 ){
		return 'safari';
	}else if( (agentStr.indexOf('msie') != -1) && (agentStr.indexOf('msie 6.0') == -1) ){
		return 'msie7';
	}
}


/* function sets different layerheight for Safari */
function setLayerHeight(){
	if( (chckBrwsr() == 'safari') || (chckBrwsr() == 'msie7') ){
		document.getElementById('middle').style.height = '60%';		
	}else{
		document.getElementById('middle').style.height = '100%';
	}	
	
	if (chckBrwsr() == 'msie7') {
		document.getElementById('outerContainer').style.paddingTop = '0px';
		document.getElementById('top').style.position = 'relative';
	}
}