javascript code for text slideshow

Hi I am posting a javascript code for text slideshow. The problem in this code is it is generating the slideshow in a random manner. But I want the slides to display in the specified manner. The trick lies in the line a=Math.floor(Math.random()*quotations.length), I hope. But I dont know how. Please help.

<SCRIPT type="text/javascript">

var quotations = new Array()

quotations[0]= "1. Iron pnictides RFe₂As₂(R = Ca, Sr, Eu etc.)."

quotations[1]= "2. Iron Chalcogenides Fe(TeSe)."

quotations[2]= "3. Topological insulators."

quotations[3]= "4. Surface and interface states."

quotations[4]= "5. Diluted magnetic semiconductors."

quotations[5]= "6. Quantum wells."

function display()

{

a=Math.floor(Math.random()*quotations.length)

document.getElementById('textslide').innerHTML=quotations[a]
document.getElementById('textslide').style.color = 'red';
document.getElementById('textslide').style.fontWeight="bold";



setTimeout("display()",1000)

}
</script>
Regards,
rocky

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