function tabSwitch(tab){

	var length = 6; //no of tabs
	for (i=1;i<=length;i++){
		document.getElementById(i).className = "";
		document.getElementById('tab_'+i).style.display = "none";
	}
	document.getElementById(tab).className="active";
	document.getElementById('tab_'+tab).style.display ="block";
}

function MM_preloadImages() { //v3.0
  var d=document; if(d.images){ if(!d.MM_p) d.MM_p=new Array();
    var i,j=d.MM_p.length,a=MM_preloadImages.arguments; for(i=0; i<a.length; i++)
    if (a[i].indexOf("#")!=0){ d.MM_p[j]=new Image; d.MM_p[j++].src=a[i];}}
}

function portWin(id){

}

MM_preloadImages('/images/but_hover.png');
MM_preloadImages('/images/menu1_hover.jpg');
MM_preloadImages('/images/menu2_hover.jpg');
MM_preloadImages('/images/menu3_hover.jpg');
MM_preloadImages('/images/menu4_hover.jpg');
MM_preloadImages('/images/menu5_hover.jpg');
MM_preloadImages('/images/send2.gif');
MM_preloadImages('/images/knopa_hover.gif');
MM_preloadImages('/images/tumb_hover.jpg');
MM_preloadImages('/images/contact_hover.jpg');