// JavaScript Document
function opacity(id, opacStart, opacEnd, millisec) { 
    //speed for each frame 
    var speed = Math.round(millisec / 100); 
    var timer = 0; 

    //determine the direction for the blending, if start and end are the same nothing happens 
    if(opacStart > opacEnd) { 
        for(i = opacStart; i >= opacEnd; i--) { 
			setTimeout("changeOpac(" + i + ",'" + id + "')",(timer * speed)); 
            timer++; 
			if (i==0) {
			setTimeout("window.location = '"+id+".php'",900);
			}
        } 
    } else if(opacStart < opacEnd) { 
        for(i = opacStart; i <= opacEnd; i++) 
            { 
            setTimeout("changeOpac(" + i + ",'" + id + "')",(timer * speed)); 
            timer++; 
        } 
    } 
} 

//change the opacity for different browsers 
function changeOpac(opacity, id) { 
    var object = document.getElementById(id).style; 
    object.opacity = (opacity / 100); 
    object.MozOpacity = (opacity / 100); 
    object.KhtmlOpacity = (opacity / 100); 
    object.filter = "alpha(opacity=" + opacity + ")"; 
} 

function shiftOpacity(id, millisec) { 
    //if an element is invisible, make it visible, else make it ivisible 
    if(document.getElementById(id).style.opacity == 0) { 
        opacity(id, 0, 100, millisec); 
    } else { 
        opacity(id, 100, 0, millisec); 
    } 
} 

function checksrc(name,id,isclick) {
	imgnamear = name.split("/");
	imgnemelg = imgnamear.length;
	wimg = imgnamear[imgnemelg-1];
	wimgstr = wimg.substr(13,1);
	wimgnam = wimg.substr(0,13);
	iddiv = 'desc_'+id+'div';
	if (document.getElementById(iddiv).style.visibility == 'hidden') {
		if (wimgstr=='1') 
			document.getElementById(id).src = "img/"+wimgnam+"2.gif";
		else
			document.getElementById(id).src = "img/"+wimgnam+"1.gif";
	}
	if (isclick==1) {
		document.getElementById('p01').src = "img/01_prods_bot_1.gif";
		document.getElementById('p02').src = "img/02_prods_bot_1.gif";
		document.getElementById('p03').src = "img/03_prods_bot_1.gif";
		document.getElementById('p04').src = "img/04_prods_bot_1.gif";
		document.getElementById('desc_p01div').style.visibility = 'hidden';
		document.getElementById('desc_p02div').style.visibility = 'hidden';
		document.getElementById('desc_p03div').style.visibility = 'hidden';
		document.getElementById('desc_p04div').style.visibility = 'hidden';
		document.getElementById(iddiv).style.visibility = 'visible';
		document.getElementById(id).src = "img/"+wimgnam+"2.gif";
	}
}

function validarForm(form) {

}