// Browser safe opacity handling function

function setOpacity( value ) {
 document.getElementById("popup_marketing").style.opacity = value / 10;
 document.getElementById("popup_marketing").style.filter = 'alpha(opacity=' + value * 10 + ')';
}

function fadeInPopupMarketing() {
 for( var i = 0 ; i <= 100 ; i++ )
   setTimeout( 'setOpacity(' + (i / 10) + ')' , 1 * i );
}

function fadeOutPopupMarketing() {
 for( var i = 0 ; i <= 100 ; i++ ) {
   setTimeout( 'setOpacity(' + (10 - i / 10) + ')' , 1 * i );
 }

 setTimeout('closePopupMarketing()', 800 );
}

function closePopupMarketing() {
 document.getElementById("popup_marketing").style.display = "none"
}

function PopupMarketing() {
 setOpacity( 0 );
 document.getElementById("popup_marketing").style.display = "block";
 closePopupProiecte();
 fadeInPopupMarketing();
}

<!-- POPUP PROIECTE IMOBILIARE -->

function setOpacityProiecte( value ) {
 document.getElementById("popup_proiecte_imobiliare").style.opacity = value / 10;
 document.getElementById("popup_proiecte_imobiliare").style.filter = 'alpha(opacity=' + value * 10 + ')';
}

function fadeInPopupProiecte() {
 for( var i = 0 ; i <= 100 ; i++ )
   setTimeout( 'setOpacityProiecte(' + (i / 10) + ')' , 1 * i );
}

function fadeOutPopupProiecte() {
 for( var i = 0 ; i <= 100 ; i++ ) {
   setTimeout( 'setOpacityProiecte(' + (10 - i / 10) + ')' , 1 * i );
 }

 setTimeout('closePopupProiecte()', 800 );
}

function closePopupProiecte() {
 document.getElementById("popup_proiecte_imobiliare").style.display = "none"
}

function PopupProiecte() {
 setOpacityProiecte( 0 );
 document.getElementById("popup_proiecte_imobiliare").style.display = "block";
 closePopupMarketing();
 fadeInPopupProiecte();
}